test(p2): faithful cellar-lip wedge reproduction + investigation apparatus (no fix yet)

P2 / M1.5 "blocked at the last step" cellar-lip wedge. This session built a faithful
deterministic reproduction and peeled the cause through six evidence-disproven framings
to one bounded question. NO fix landed — the last layers were each disproven by evidence,
and guessing at the load-bearing collision code is the saga's failure mode.

Apparatus:
- CellarLipWedgeTests.cs + Fixtures/cellar-lip/ (3 real cell dumps + wedge-records.jsonl =
  29 captured ACDREAM_CAPTURE_RESOLVE wedge calls). Replays the exact calls + body-before
  through the lip-cell engine: all 29 reproduce at 0% advance in <200 ms. Tests are
  documents-the-bug / diagnostics (GREEN while the wedge exists).
- TEMP probes ([path5-wall]/[fw-enter]/[find-walkable] in BSPQuery; [neg-poly]/[stepsphereup]/
  [stepdown-decide]/CheckOtherCells cn/sn/negHit in TransitionTypes), gated on
  ACDREAM_PROBE_INDOOR_BSP, marked STRIP. TransitionTypes neg-poly shortcut has a reverted-fix
  comment (slide attempt didn't clear the wedge).
- tools/cdb/retail-*-trace.cdb (retail cdb traces).

Findings (handoff: docs/research/2026-06-04-p2-cellar-lip-flatfloor-cp-handoff.md, see the
"NEXT-SESSION KICKOFF" at top):
- Flat-floor contact plane is retail-faithful (v1 trace, full-file correlation). NOT the bug.
- PosHitsSphere cull sign is retail-faithful (cdb -z verified; the Binary Ninja `test ah,N; jp`
  parity-jump reads inverted — caught + reverted a wrong fix from that mis-read).
- Sphere radius correct (0.48 player / 0.30 camera probe).
- Retail connector cell 0xA9B40175 never blocks (CEnvCell::find_collisions trace: 0 Collided/Slid).
- PINNED: during the step-up's step-down, BSPQuery.FindWalkableInternal is never called for cell
  0171, so the cottage floor (poly 0x0023, Z=94) is never tested as walkable -> no contact plane
  -> step-up fails -> StepUpSlide=Collided -> wedge.

Next: trace FindEnvCollisions -> FindCollisions path dispatch for 0171 during StepDown=true (why
StepSphereDown/find_walkable is skipped), port retail, validate via CellarLipWedgeTests, regress
DoorBugTrajectoryReplayTests + visual gate.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/research/2026-06-04-p2-cellar-corner-stepup-handoff.md

@@ -1,5 +1,20 @@
 # P2 pickup — cellar-top corner wedge = cell-resolver ping-pong (re-diagnosed) reverting a WORKING step-up
 
+> **🟢 SUPERSEDED 2026-06-04 PM — the wedge is NOT membership and NOT a reverted landing.**
+> Canonical findings + full evidence chain are now in `memory/project_p2_door_stepup_findings.md`
+> (the "RE-DIAGNOSIS 2" + "SLIDE LOCALIZED" + "FAILING CONDITION PINNED" entries). One-line summary:
+> a live **retail cdb trace** proved retail's carried cell ALSO flips 0174/0175/0171 at the lip yet
+> retail is smooth → membership ruled out. The wedge is a **step-up coin-flip**: the step-up's
+> internal step-down FAILS to set a contact plane on the FLAT cottage floor (`cpValid=False`,
+> `walkInterp=1.0`) while it works on the ramp slope. acdream's `StepSphereDown`/`AdjustSphereToPlane`
+> are FAITHFUL to retail (verified vs `find_walkable` pc:326793 + `adjust_sphere_to_plane` pc:322032),
+> so the obvious "set the CP anyway" fix DIVERGES from retail — do NOT ship it. **NEXT STEP (ready):**
+> run `tools/cdb/retail-flatfloor-trace.cdb` on the live retail client at the cellar lip to see whether
+> retail's `step_sphere_down` returns 3 (sets CP) or 1 (no CP) on the flat floor — that decides where
+> retail establishes the flat-floor contact plane, then port it. 4 TEMP probes (gated on
+> ACDREAM_PROBE_INDOOR_BSP, marked STRIP) are uncommitted in the worktree. The text below is HISTORY.
+
+
 > **Canonical pickup, 2026-06-04.** Branch `claude/thirsty-goldberg-51bb9b` (do NOT
 > branch/worktree; do NOT push without asking; NEVER `git stash`/`gc`). PowerShell on
 > Windows; launch logs are UTF-16.

docs/research/2026-06-04-p2-cellar-lip-flatfloor-cp-handoff.md

@@ -0,0 +1,445 @@
+# P2 cellar-lip wedge — CANONICAL handoff (flat-floor contact-plane coin-flip)
+
+## ▶ NEXT-SESSION KICKOFF (START HERE — supersedes everything below)
+
+**State:** M1.5 / P2 cellar-lip "blocked at the last step" wedge. A FAITHFUL deterministic reproduction now
+exists. The cause has been peeled through SIX evidence-disproven framings to one bounded question. No fix
+landed (intentionally — the last layers were each disproven; do NOT guess, the collision code is load-
+bearing). Branch `claude/thirsty-goldberg-51bb9b` (do NOT branch/worktree; do NOT push w/o asking; NEVER
+`git stash`/`gc`). PowerShell on Windows; launch logs UTF-16. Use `superpowers:systematic-debugging`.
+
+**READ (in order):** (1) THIS file's `## SESSION-END` + `UPDATE 1` + `UPDATE 2` (the live captures + the
+pinned root cause) and `CORRECTION 1`/`CORRECTION 2` (CP + cull are RETAIL-FAITHFUL, proven). (2)
+`memory/project_p2_door_stepup_findings.md`.
+
+**DONE — faithful apparatus (uncommitted in worktree; RECOMMEND committing first):**
+`tests/AcDream.Core.Tests/Physics/CellarLipWedgeTests.cs` + `Fixtures/cellar-lip/0xA9B4017{1,4,5}.json` +
+`Fixtures/cellar-lip/wedge-records.jsonl` (29 real `ACDREAM_CAPTURE_RESOLVE` wedge calls). Replays the EXACT
+captured calls (seed body-before, real climb dir −X,+Y) through the lip-cell engine — **all 29 reproduce
+the wedge at 0% advance in <200 ms.** Tests (all GREEN as documents-the-bug/diagnostics):
+`DocumentsWedge_LiveFloorCp_PlayerStuckAtCottageFloorEdge`, `Diagnostic_ReplayLiveWedgeRecords_Advance`,
+`Diagnostic_ReplayFloorCpRecord_StepUpProbes` (→ `%TEMP%/lip-wedge-stepup.log`), + 2 synthetic.
+
+**DISPROVEN — do NOT re-investigate:** flat-floor CP (retail also no-CP, smooth — Correction 1); the
+`PosHitsSphere` cull sign (retail-faithful, `cdb -z`-verified — Correction 2); sphere radius (0.48=player
+correct, 0.30=camera probe); the A6.P4 neg-poly `Collided`→`slide_sphere` shortcut (fix attempted + reverted,
+didn't clear it — the slide returns offset=0 then degenerates to Collided on re-check).
+
+**PINNED ROOT-CAUSE LAYER (UPDATE 2):** during the step-up's step-down (`DoStepUp`→`DoStepDown`→
+`TransitionalInsert(5)`), **`BSPQuery.FindWalkableInternal` is NEVER called for cell 0171** (confirmed after
+a CLEAN rebuild — `[fw-enter]` TEMP probe fires 0×). So the cottage floor (0171 poly 0x0023, n=(0,0,1),
+Z=94) is **never tested as walkable** → no contact plane → step-down rejects (`cpValid=False`) → step-up
+fails → `StepUpSlide=Collided` → wedge. `[other-cells] iter=0171 result=OK` is returned WITHOUT reaching
+`StepSphereDown`→`find_walkable`.
+
+**THE JOB (bounded, evidence-first — NO speculative edits):**
+1. Trace `Transition.FindEnvCollisions` (TransitionTypes.cs) → `BSPQuery.FindCollisions` PATH DISPATCH for
+   cell 0171 when `StepDown=true`. Find WHY `StepSphereDown`/`FindWalkableInternal` is skipped — candidates:
+   entry `NodeIntersects` early-OK; Path 1 (Placement) taken (DoStepDown's placement insert); the primary
+   0175 collision returning Collided (the −X-wall Path-5 `StepSphereUp`, `stepUp=stepDown=False` = the OUTER
+   non-step pass) short-circuiting before `CheckOtherCells(0171)`; or StepDown not actually set on that call.
+   Use the `[fw-enter]`/`[find-walkable]` TEMP probes — **FORCE A CLEAN REBUILD (`Remove-Item obj,bin`) for
+   any Core probe edit; `dotnet test`/`dotnet build` incremental did NOT pick up new BSPQuery.cs probes
+   (cost two probe rounds).**
+2. Port retail's behavior (oracle: `CEnvCell::find_collisions` pc:309560 → `BSPTREE::find_collisions`
+   pc:323725 Path-3 → `BSPTREE::step_sphere_down` pc:323665 → `BSPLEAF::find_walkable` pc:326793). Verify
+   how retail's step-down reaches `find_walkable` on the cottage floor where acdream's does not.
+3. Fix → VALIDATE: flip `CellarLipWedgeTests.DocumentsWedge_LiveFloorCp_*` to `advance>0.25·requested` →
+   GREEN; `Diagnostic_ReplayLiveWedgeRecords` advance% jumps off 0%. 4. REGRESSION: `DoorBugTrajectoryReplayTests`
+   + full Core suite. **VISUAL GATE: cellar ascent clean (no last-step wedge) + inn door BLOCKS + generic
+   step-up climbs.**
+
+**ENABLER:** `cdb -z "C:\Turbine\Asheron's Call\acclient.exe"` = offline static disasm + `uf` w/ PDB symbols
+(no live attach); use it to verify any retail branch/offset (the cull-sign error was a BN parity-jump
+mis-read — never trust BN `if(p)` for `test ah,N; jp`).
+
+**Apparatus (uncommitted, worktree):** the test + fixtures above; TEMP probes in `BSPQuery.cs`
+(`[path5-wall]`,`[fw-enter]`,`[find-walkable]`, STRIP) + `TransitionTypes.cs` (`[neg-poly]`,`[stepsphereup]`,
+`[stepdown-decide]`, CheckOtherCells cn/sn/negHit, STRIP) all gated on `ACDREAM_PROBE_INDOOR_BSP`; captures
+`lip-wedge-resolve.jsonl`/`lip-cells/`/`launch-*.log`; cdb scripts `tools/cdb/retail-connector-collide-trace.cdb`
+(+ flatfloor/lip); analyzers `analyze_wedge_jsonl.py`/`extract_wedge_records.py`/`analyze_v1_corr.py`;
+`cdbz-disasm.txt`/`cdbz-poshits.txt`. **Test baseline:** Core prior 1310p/4f/1s + 5 GREEN lip tests; App 177.
+
+---
+
+> **Canonical pickup, 2026-06-04 PM.** Branch `claude/thirsty-goldberg-51bb9b` (do NOT
+> branch/worktree; do NOT push without asking; NEVER `git stash`/`gc`). PowerShell on
+> Windows; launch logs are UTF-16. This SUPERSEDES the membership re-diagnosis in
+> `docs/research/2026-06-04-p2-cellar-corner-stepup-handoff.md` (now history) and folds in
+> the full chain from `memory/project_p2_door_stepup_findings.md`.
+
+---
+
+## 🧪 SESSION-END 2026-06-04 PM — deterministic repro BUILT + first fix attempt REVERTED
+
+**Apparatus shipped (uncommitted in worktree):** `tests/AcDream.Core.Tests/Physics/CellarLipWedgeTests.cs`
++ fixtures `tests/AcDream.Core.Tests/Fixtures/cellar-lip/0xA9B4017{1,4,5}.json` (copied from `lip-cells/`).
+Loads the 3 lip cells (synthetic single-leaf BSP, same as `CellarUpTrajectoryReplayTests`), seeds the
+player (r=0.48, foot bottom Z=93.456 → foot-sphere center Z=93.936 = the live wedge) carried in slab
+0175, drives forward. **Reproduces the wedge deterministically in <90 ms:** the player FREEZES, blocked
+by the threshold slab's −X side wall (poly normal world (1,0,0)). Two tests, both GREEN as documents-the-
+bug: `Diagnostic_DriveOffThreshold_DumpTrajectory` (dumps trajectory+probes to `%TEMP%/lip-wedge-diag.log`
+via Console redirect) + `DocumentsWedge_PlayerFrozenAtThreshold_BlockedByMinusXWall`.
+
+**FIX ATTEMPT #1 — REVERTED.** Hypothesis: the A6.P4 neg-poly `NegStepUp==false` branch
+(`TransitionTypes.cs` ~line 1083) returns `Collided` (a deliberate "simpler response" shortcut; the
+comment says the slide was deferred), where retail dispatches `neg_step_up==0 → slide_sphere`. Replaced
+it with `SlideSphereInternal(NegCollisionNormal, GlobalCurrCenter[0].Origin)` (mirroring the NegStepUp=
+true branch). **Did NOT fix the wedge** → reverted. WHY: the slide returns `Slid` with **offset=0** (the
+−Y displacement is already along the crease `dir=cross((1,0,0),(0,0,1))=(0,−1,0)`), so the sphere
+doesn't move; the loop re-checks with `gDelta≈0` → `SlideSphere`'s `offset.LengthSquared<ε → Collided`
+branch (`TransitionTypes.cs:2877`) → revert. So the bug is NOT the shortcut alone — it's the
+**slide/loop-commit**: the parallel-graze slide produces no advance, and the re-check degenerates to
+Collided.
+
+**TWO GAPS for the next pass:**
+1. **Faithful repro:** the synthetic drive direction (world −Y) is a GUESS and is PARALLEL to the −X
+   wall (keeps grazing). The real climb direction is unknown without the exact `targetPos`. **Get a
+   short `ACDREAM_CAPTURE_RESOLVE=<path>` JSONL of the live wedge** (one acdream run, wedge ~5 s) → wire
+   a `LiveCompare`-style test (the proven `CellarUpTrajectoryReplayTests` pattern) with the exact
+   currentPos/targetPos/body-before. That makes the RED test faithful + the fix validatable.
+2. **The real fix is in the slide/loop:** why does retail's `slide_sphere` advance the sphere PAST the
+   parallel graze where acdream's returns offset=0 then degenerates to Collided on re-check? Trace
+   retail `CSphere::slide_sphere` (pc:321660) vs acdream `SlideSphere` (`TransitionTypes.cs:2826`) for
+   the parallel-wall + grounded case, AND why the loop re-check sees `gDelta≈0`. NOTE the live wedge
+   used the **NegStepUp=TRUE** path (StepSphereUp→StepUpSlide=Collided) while the synthetic repro used
+   **NegStepUp=FALSE** (neg-poly-dispatch→Collided) — BOTH end in `SlideSphere`/`SlideSphereInternal`
+   returning Collided, so the common fix point is `SlideSphere`'s degenerate-offset handling, not the
+   dispatch branch. **DOOR REGRESSION RISK:** any `SlideSphere`/neg-poly change touches the A6.P4 door
+   block — regression-test `DoorBugTrajectoryReplayTests` + visual-gate the inn door BLOCKS.
+
+**Test baseline unchanged:** the 2 new lip tests are GREEN (documents-the-bug). Build green. The reverted
+fix leaves `TransitionTypes.cs` functionally identical (only an explanatory comment added at the shortcut).
+
+### UPDATE (same session, later) — FAITHFUL repro BUILT + ROOT CAUSE PINNED
+
+Got the JSONL (`ACDREAM_CAPTURE_RESOLVE` → `lip-wedge-resolve.jsonl`, 17K player records). The real climb
+direction is **−X,+Y** (my synthetic −Y guess was backwards). Extracted 29 representative wedge records to
+`tests/AcDream.Core.Tests/Fixtures/cellar-lip/wedge-records.jsonl` (`extract_wedge_records.py`).
+`CellarLipWedgeTests` now replays the EXACT captured calls (seed body-before, replay `ResolveWithTransition`
+through the lip-cell engine): **all 29 reproduce the wedge bit-faithfully (0% advance).** New tests (all
+GREEN as documents-the-bug / diagnostics): `Diagnostic_ReplayLiveWedgeRecords_Advance`,
+`Diagnostic_ReplayFloorCpRecord_StepUpProbes`, `DocumentsWedge_LiveFloorCp_PlayerStuckAtCottageFloorEdge`.
+
+**ROOT CAUSE PINNED** (via `Diagnostic_ReplayFloorCpRecord_StepUpProbes` → `%TEMP%/lip-wedge-stepup.log`):
+the player is at the doorway EDGE of the cottage floor. The step-up (triggered by the −X wall, normal
+(1,0,0), STEEP) → step-down → multi-cell check reaches **0171 poly 0x0023 = the cottage floor** (n=(0,0,1),
+world Z=94). The 0.48 sphere **OVERLAPS** it (`overlapsSphere=True`, `dist=−0.085`) — BUT it's **REJECTED
+because the sphere center projects outside the floor poly's edge** (`insideEdges=False`, `gap=−0.395`). So
+`[other-cells] iter=0171 result=OK` (NOT Adjusted), no contact plane is set → `[stepdown-decide] cpValid=
+False accept=False` → step-up FAILS → `StepUpSlide=Collided` → wedge. Retail accepts the floor at its edge
+and crosses (0175 never blocks). **This is a WALKABLE-EDGE acceptance divergence**, not a CP/cull/slide bug.
+
+**THE FIX (next, narrow):** compare acdream's walkable-edge math vs retail for the sphere-overlaps-floor-
+but-center-outside-edge case. Actual walkable test = `BSPQuery.WalkableHitsSphere` (254) →
+`PolygonHitsSpherePrecise` (overlap) + `AdjustSphereToPlane` (351); `[other-cells] result=OK` means one of
+them returned false for poly 0x0023. The `[walkable-nearest]` diagnostic uses `CheckWalkable` (287, the
+edge/`insideEdges` test). Retail oracle: `CPolygon::walkable_hits_sphere` (pc:323006) +
+`CPolygon::check_walkable` (pc:322811) + `CPolygon::adjust_sphere_to_plane` (pc:322032). Read which one
+rejects the edge-overlap and why retail accepts it. **Validate with `CellarLipWedgeTests` (flip
+`DocumentsWedge_LiveFloorCp_*` to assert advance>0.25·requested). DOOR REGRESSION RISK: walkable changes
+are global — run `DoorBugTrajectoryReplayTests` + visual-gate the inn door BLOCKS + generic step-up climbs.**
+Apparatus: `lip-wedge-resolve.jsonl`, `Fixtures/cellar-lip/*`, `analyze_wedge_jsonl.py`,
+`extract_wedge_records.py`, `%TEMP%/lip-wedge-stepup.log`.
+
+### UPDATE 2 — deeper: `find_walkable` is NEVER called during the step-down (cottage floor never tested)
+
+Drilled one layer further with TEMP probes `[fw-enter]`/`[find-walkable]` in `BSPQuery.FindWalkableInternal`
+(gated on `ACDREAM_PROBE_INDOOR_BSP`, marked STRIP, uncommitted). **Confirmed after a CLEAN rebuild (deleted
+obj/bin) — `[fw-enter]` fires ZERO times** while the prior probes fire. So during the step-up's step-down
+(`DoStepUp`→`DoStepDown`→`TransitionalInsert(5)`), `FindWalkableInternal` is **never reached** for 0171 (nor
+0175): the cottage floor poly 0x0023 is never tested by the walkable finder. `[other-cells] iter=0171
+result=OK` is returned WITHOUT `StepSphereDown`→`FindWalkableInternal`. So the "walkable-edge acceptance"
+framing in UPDATE 1 is one level too shallow — the floor isn't *rejected* by the edge test, it's never
+*tested* at all. Root: `FindEnvCollisions`/`BSPQuery.FindCollisions` for 0171 during the step-down returns OK
+on a path BEFORE Path 3 (StepDown→StepSphereDown). **NEXT: trace `FindEnvCollisions` (TransitionTypes) → which
+`FindCollisions` path 0171 takes during `StepDown=true` (entry NodeIntersects early-out? Path 1 Placement?
+the primary-0175 result short-circuiting CheckOtherCells?) and why StepSphereDown/find_walkable is skipped.**
+The `[stepsphereup] stepUpFlag=False stepDownFlag=False` means the −X-wall StepSphereUp is the OUTER
+(non-step) collision; the step-DOWN that should find the floor is a separate inner insert that never runs
+find_walkable. NOTE: a clean `dotnet build`/`dotnet test` did NOT pick up new `BSPQuery.cs` probes until
+`Remove-Item obj,bin` — **force a clean rebuild when adding Core probes** (cost two probe rounds this session).
+
+**HONEST STATUS: NO FIX. The collision/step path is deeper than a single-line fix** — 6+ framings this
+session (CP→cull→slide→neg-poly→walkable-edge→find_walkable-not-called), each disproven by evidence and the
+next layer exposed. This is the systematic-debugging "question the architecture" signal. The FAITHFUL repro
+(`CellarLipWedgeTests`, 29 records @0% advance) makes the next attempt iterable; the next move is the
+`FindEnvCollisions`/`FindCollisions`-path trace above, NOT another speculative edit. The collision code is
+load-bearing (every floor/wall/step) — do not guess.
+
+---
+
+## ⚠️ CORRECTION 2026-06-04 (next session) — THE CP IS RETAIL-FAITHFUL; v2 IS MOOT
+
+**The "decisive question" below is ANSWERED from the EXISTING v1 log — no new retail trace
+needed.** The v1 `retail-flatfloor-trace.log` was wrongly dismissed as a `gu` artifact. It is
+**real data.** Proof (full-file correlation over all 5,349 records, `analyze_v1_corr.py`):
+- sphere **z ≤ 90.0 → pure ret=3** (CP set); **z = 94.01 (the flat cottage floor) → pure ret=1
+  (NO-CP), 877 records, zero ret=3**; ret mixes only in the **ramp transition zone (90–93.7)**,
+  which is physical. A corrupted-`eax` artifact CANNOT produce two large pure populations at
+  opposite Z extremes with a physical transition between — the ret tracks the input Z exactly.
+- **`walk_interp = 1.0 → ret=1 (no-CP) 770×`** — i.e. retail, with `walk_interp=1.0` on the flat
+  floor, gets NO contact plane and is **smooth**. That is the *exact* acdream condition
+  (`walkInterp=1.000 cpValid=False`).
+- `cdb -z acclient.exe` (offline static disasm, symbols) confirms `BSPTREE::step_sphere_down`
+  `+0x218`=`mov eax,3;ret` (reached only after `[eax+18h]=1` contact_plane_valid + `set_walkable`)
+  and `+0x227`=`mov eax,1;ret` (early `je` when `find_walkable` found nothing). So ret3↔CP-set,
+  ret1↔no-CP is certain.
+
+**ANSWER:** retail's `step_sphere_down` returns **NO-CP (ret 1)** on the flat cottage floor —
+exactly like acdream — and retail crosses smoothly. **The contact plane is NOT the divergence.**
+Both "if NO-CP → trace set_contact_plane callers" and "if SET-CP → divergence in StepSphereDown"
+branches below rest on a FALSE premise (that retail establishes a flat-floor CP somewhere). It
+does not. **Do NOT run the v2 trace; do NOT hunt a retail flat-floor CP path.**
+
+**REDIRECTED diagnosis (back to the connector recovery — the `RE-DIAGNOSIS 2` / `SLIDE LOCALIZED`
+line in memory, which the flat-floor-CP finding had wrongly sidelined):** the wedge is the
+per-cell collide on **connector 0175** returning **Slid** during the recovery, which reverts the
+good floor landing. Static comparison this session confirms the recovery structures ALL MATCH
+retail: `find_collisions` Contact full-hit → `step_sphere_up`; `step_up` fail → `step_up_slide`
+→ `slide_sphere` (retail `CSphere::step_sphere_up` pc:321611–321638, `step_up_slide` pc:273930);
+`check_other_cells` halts on Slid (4) clearing CP (pc:272717, `cdb -z` jump-table on `(result-1)`);
+acdream `TransitionalInsert` *continues* (no revert) on Slid (TransitionTypes.cs:881). The SOLE
+open question: **does retail's per-cell `CEnvCell::find_collisions` return Slid (recover & slide)
+or OK (never hits) for connector 0175 at the lip?**
+- OK in retail → acdream's connector Slid is SPURIOUS (over-detect / over-step-up 0175) → fix there.
+- Slid in retail → retail slides+continues; acdream's wedge is the substep **REVERT** upstream
+  (`FindTransitionalPosition` / `ResolveWithTransition`), not the collide.
+
+**NEW decisive trace (READY, robust, no `gu`):** `tools/cdb/retail-connector-collide-trace.cdb`
+breaks `CEnvCell::find_collisions+0x1e` (the SINGLE exit; `esi`=`this`, `eax`=result; cell id
+`poi(esi+0x28)`), logs ret per lip cell 0xA9B4017X. Built + offset-verified entirely offline via
+`cdb -z` (no live attach). **ENABLER:** `cdb -z "C:\Turbine\Asheron's Call\acclient.exe"` does
+offline static disassembly with full PDB symbols — verify any trace offset without a running client.
+
+Everything below this banner is RETAINED FOR HISTORY (the flat-floor-CP hypothesis, now disproven).
+
+---
+
+## ⚠️ CORRECTION 2 — 2026-06-04 PM (live retail + acdream captures; the REAL mechanism)
+
+Two live captures this session settled it. **Retail-connector trace** (`tools/cdb/retail-connector-collide-trace.cdb`
+→ `retail-connector-collide-trace.log`, breaking `CEnvCell::find_collisions+0x1e`, single nesting-safe exit):
+over ~85K samples the **connector cell 0175 returns 2692 OK + 94 Adjusted + 0 Collided + 0 Slid** — it
+**never blocks**. (Floor 0171 and 0174 DO block — real cottage-room walls — so the trace is working.) So
+the connector is a pure pass-through / successful-step-up in retail; acdream spuriously blocks it.
+
+**acdream live capture at the wedge** (`launch-lip-capture.log`, ACDREAM_PROBE_INDOOR_BSP=1 + the 4 TEMP
+probes + cell dumps `lip-cells/0xA9B4017{1,4,5}.json`) — the stuck state is:
+```
+[indoor-bsp] cell=0xA9B40175 lpos=(8.523,-2.251,-0.064) lprev=(8.520,-2.251,-0.064) r=0.480 result=OK
+[stepdown-decide] cell=0xA9B40175 insert=OK cpValid=False cpNz=1.000 walkableZ=0.664 accept=False pos=(...,93.456)
+[stepsphereup] cell=0xA9B40175 stepUpFlag=False stepDownFlag=False n=(1.00,0,0) stepped=False
+[stepsphereup] cell=0xA9B40175 StepUpSlide=Collided
+[indoor-bsp] cell=0xA9B40175 r=0.480 result=Collided
+```
+**Decoded mechanism (this is NOT the memory's "connector Slid" — that was a pre-B1-fix state):**
+- **0175 is a 0.364 m-tall threshold SLAB** (dump: 4 solid side walls at local X=7/9, Y=−2.85/1.15;
+  open floor/ceiling portals poly4→0171, poly5→0174; WorldTransform 180°-rot at (161.929,7.503,94)).
+- The wedge uses the **r=0.48 body sphere** (Ø0.96 — *bigger than the slab is tall*), centered at world
+  Z=93.936 (local Z=−0.064, i.e. SUNK into the threshold, ~0.5 m below resting-on-floor Z≈94.48).
+- That oversized sphere genuinely **full-hits** the −X wall (poly 3, X=9; sphere at X=8.523 reaches
+  X=9.003 — a **3 mm graze**; `moveDot<0` so retail would keep it too) → `BSPQuery.StepSphereUp`
+  (Path 5, BSPQuery.cs:1849/1380) → **`DoStepUp` fails** (its internal step-down finds no CP on the flat
+  floor — `[stepdown-decide] cpValid=False`, retail-faithful per Correction 1) → **`StepUpSlide` →
+  `SlideSphereInternal` returns `Collided`** → `FindEnvCollisions` returns Collided → wedge. The 3 mm
+  graze is hair-trigger → explains the intermittency.
+
+**CULL SIGN = RED HERRING (verified faithful).** Mid-session I believed acdream's `PosHitsSphere` cull
+(`if moveDot>=0 return false`) was OPPOSITE retail. **WRONG** — `cdb -z uf acclient!CPolygon::pos_hits_sphere`
+shows `test ah,5; jp +0x46`. `jp` is a **parity** jump; the cull branch is taken on EVEN parity = `{dot>=0}`.
+So retail **keeps the hit when `dot<0`, culls when `dot>=0`** — IDENTICAL to acdream + ACE (`if dist>=0
+return false`). Movement convention also matches (both `check−curr`: acdream BSPQuery.cs:1663, retail
+find_collisions). **Do NOT touch the cull.** The Binary Ninja pseudo-C renders `test ah,5; jp` as
+`if (p) return 0` which READS like "cull when dot<0" — it is not; the parity decode is inverted. LESSON:
+verify any cull/branch sign against `cdb -z`, never the BN `if(p)` rendering of a parity jump.
+
+**ENABLER:** `cdb -z "C:\Turbine\Asheron's Call\acclient.exe"` does offline static disasm + `uf` with full
+PDB symbols — used to build/verify the connector trace AND to catch the cull-sign error. Ghidra `patchmem`
+addresses do NOT match the PDB/BN addresses (0x005394f0 → `CPolygon::UnPack` in Ghidra); use `cdb -z`.
+
+**THE SHARP REMAINING QUESTION:** at the thin slab, **why does retail's step-up SUCCEED (climb onto the
+cottage floor, find_collisions returns OK) where acdream's `DoStepUp` FAILS (no CP → StepUpSlide=Collided)?**
+Sub-leads: (a) **RULED OUT — r=0.48 vs r=0.30 is two DIFFERENT movers, not a bug.** r=0.48 = the PLAYER
+(`PlayerMovementController.cs:1116`, "human player radius from Setup"); r=0.30 = the CAMERA collision
+probe (`PhysicsCameraCollisionProbe.cs:18` `ViewerSphereRadius=0.3`, single sphere). The smooth r=0.30
+crossings are the camera spring-arm; the wedge is the player. Player radius 0.48 is correct. So the
+question is purely the player step-up, NOT the sphere. Open: why is the player SUNK to Z=93.936 (0.5 m
+below resting-on-floor Z≈94.48) at the threshold — is that retail-faithful (it's mid-climb from the
+cellar) or a position error? (b) does retail even full-hit 0175's wall, or does its sphere clear it
+(position)? (c) the
+flat-floor step-up success path (Correction 1's open question — retail's step_up establishes the floor
+CP via some path acdream lacks). NEXT: either build a deterministic harness test from `lip-cells/*.json`
+(place the r=0.48 sphere at the captured wedge pos, assert FindCollisions returns OK not Collided — RED→
+GREEN), or one targeted retail trace of `CSphere::step_sphere_up`/`CTransition::step_up` at 0175 (does it
+return 1/OK or fall to step_up_slide?). Apparatus committed-in-worktree: `tools/cdb/retail-connector-collide-trace.cdb`,
+`lip-cells/0xA9B4017{1,4,5}.json`, `launch-lip-capture.log`, `cdbz-disasm.txt`, `cdbz-poshits.txt`,
+`analyze_v1_corr.py`. TEMP `[path5-wall]` probe added to BSPQuery.cs Path 5 (STRIP; was NOT in the stale
+--no-build binary, so it didn't fire — rebuild to use it).
+
+---
+
+## State both altitudes
+- **Milestone:** M1.5 — Indoor world feels right.
+- **Effort:** P2 of the verbatim spatial-pipeline port
+  (`docs/superpowers/specs/2026-06-03-verbatim-spatial-pipeline-port-master-plan.md`).
+- **Symptom (user words):** "run up the cellar stairs, get blocked at the last step;
+  sometimes through, sometimes not." Retail is always smooth there.
+- **This session's outcome:** NO fix landed. The diagnosis was corrected three times with
+  evidence; the wedge is now precisely localized; the FINAL decisive question is still open
+  because the retail trace tooling (`gu` in a bp action) produced an artifact. One clean v2
+  retail trace pins it. Everything is saved; resume cold.
+
+## The corrected diagnosis (evidence chain — all three prior theories DISPROVEN)
+1. **NOT membership / cell-resolver ping-pong** (the prior handoff's claim). A live **retail
+   cdb trace** (`tools/cdb/retail-lip-trace.cdb` → `retail-lip-trace.log`, breaking
+   `CTransition::step_up`, logging `sphere_path.check_pos.objcell_id`) proved retail's carried
+   cell ALSO alternates `0xA9B40174/0175/0171` at the lip (181/40/17 over 238 step_ups), yet
+   retail crosses smoothly. So the carried-cell flip is retail-faithful — a "keep the cell
+   stable" / `ResolveCellId`-stickiness fix would DIVERGE from retail. Also: the production
+   `[cell-transit] reason=resolver` is the SWEPT `find_cell_list` pick (`RunCheckOtherCellsAndAdvance`
+   → `CellTransit.FindCellSet`), NOT `PhysicsEngine.ResolveCellId` (which is only the cache-null
+   test fallback). `result.cellId` is STABLE in runs of 100s of ticks in
+   `acdream-corner-capture.jsonl` (154K recs).
+2. **NOT a reverted landing (the M1 guess).** In `acdream-corner-capture.jsonl` the player
+   reaches the floor (Z=94.0, cpz 0.78→1.00) and WALKS ON into the cottage (idx 7215→7244);
+   the landing commits fine.
+3. **IT IS: a step-up coin-flip on the FLAT cottage floor.** The `[stepdown-decide]` probe
+   (in `Transition.DoStepDown`) shows the trigger unambiguously:
+   - `accept=True  (1845×): insert=OK cpValid=True`  on the RAMP (cpNz=0.781, Z≈93.3, walkInterp≈0)
+   - `accept=False ( 849×): insert=OK cpValid=False cpNz=1.000 walkInterp=1.000`  on the FLAT floor (Z=94.0)
+
+   The step-up's acceptance check (`insert==OK && ContactPlaneValid && cpNz>=walkableZ`,
+   `TransitionTypes.cs:3147`) rejects ONLY when `cpValid=False`, which happens ONLY on the FLAT
+   floor: the sphere is already settled → `adjust_sphere_to_plane` is a no-op → `FindWalkableInternal`
+   records no poly (its gate is `walkable && adjusted`, `BSPQuery.cs:736`) → `StepSphereDown`
+   (`BSPQuery.cs:1216`) sets no contact plane → reject. On the RAMP the sphere is always sliding
+   (adjusted=true) so the CP is set → accept. **Ramp = adjusting = works; flat floor = settled =
+   no CP = fails.** The `[stepsphereup]` probe corroborates: lip-riser step-up (cell 0171,
+   n=(0,-1,0)) = 443 success / 445 fail; connector +X corner wall (cell 0175, n=(1,0,0)) = 74 fail
+   → recursive `StepSphereUp` → `StepUpSlide` = 401 Slid / 203 Collided overall.
+
+## Why the OBVIOUS fix is WRONG (do not ship it)
+"Just set the contact plane whenever a walkable poly is found, even without adjustment" — this
+DIVERGES from retail. Verified against the decomp:
+- `BSPLEAF::find_walkable` (`acclient_2013_pseudo_c.txt:326793`) gates BOTH the poly AND the
+  changed-flag on `walkable_hits_sphere && adjust_sphere_to_plane` — IDENTICAL to acdream's
+  `FindWalkableInternal`.
+- `CPolygon::adjust_sphere_to_plane` (`:322032`) updates `walk_interp` and returns 1 only when
+  `new_interp = (1-t)*walk_interp < walk_interp`, i.e. `t>0` (the sphere must move toward the
+  plane). For a SETTLED sphere (`t≈0`) retail ALSO returns 0 → records no poly → sets no
+  step-down CP.
+So acdream's `StepSphereDown` + `AdjustSphereToPlane` are FAITHFUL. Retail must establish the
+flat-floor contact plane through a DIFFERENT path during the climb — that path is what's still
+unknown.
+
+## THE DECISIVE OPEN QUESTION + the v2 trace protocol
+**Does retail's `BSPTREE::step_sphere_down` SET the contact plane (ret 3) or NOT (ret 1) on the
+flat floor cell (0xA9B40171)?**
+- v1 trace FAILED: `gu` inside a cdb bp action ("commands skipped … target execution inside an
+  event handler") corrupted eax → perfect `1,3,1,3` alternation artifact (run-length=1; the
+  4216/1133 histogram is meaningless). **NEVER use `gu` in a cdb bp action.**
+- v2 trace READY: `tools/cdb/retail-flatfloor-trace.cdb` — stashes the cell in `$t3` at entry
+  via `@@c++`, counts at the two RETURN addresses (no `gu`). **STEP 0: verify the +0x218 (ret 3)
+  / +0x227 (ret 1) offsets against the `u acclient!BSPTREE::step_sphere_down` disassembly the
+  script logs, fix if needed, re-attach, THEN have the user wedge ~10s.**
+- Interpretation: if floor cell 0171 is mostly **NO-CP** → retail establishes the floor CP via a
+  DIFFERENT path → next trace breaks `COLLISIONINFO::set_contact_plane` and logs the CALLER
+  (`poi(@esp)`) for normal≈(0,0,1) to find that path, then port it. If mostly **SET-CP** → the
+  divergence is inside acdream's `StepSphereDown`/`AdjustSphereToPlane` after all (re-read the
+  `walk_interp`/`t` math vs ACE).
+
+## Leading hypothesis (UNCONFIRMED, pending v2)
+Retail's step-up ALSO "fails" on the settled flat floor (step_sphere_down no-CP) but **recovers
+via `step_up_slide` smoothly**, where acdream wedges — so the divergence may be in the SLIDE
+RECOVERY (`SpherePath.StepUpSlide` → `Transition.SlideSphereInternal`, the B1/`slide_sphere`
+area, commits `abbd761`/`0935a31`) and/or the connector-cell-0175 `StepSphereUp` interference,
+NOT the contact plane itself. The B1/slide fixes are correct FOR THE DOOR; re-investigation is
+warranted FOR THE CELLAR recovery only.
+
+## Retail decomp anchors (verified this session)
+`CTransition::step_up` pc:273099 (clears CP @273103, calls step_down) · `CTransition::step_down`
+pc:272946 (the `if (step_up==0)` lower-gate @272954; `transitional_insert(5)`; accept iff
+`!cond:0 && contact_plane_valid` @272968) · `BSPTREE::step_sphere_down` pc:323665 (sets
+`contact_plane_valid=1` UNCONDITIONALLY when a poly is found @323711; return 3) ·
+`BSPLEAF::find_walkable` pc:326793 · `CPolygon::adjust_sphere_to_plane` pc:322032 ·
+`CTransition::transitional_insert` pc:273137 (neg_poly_hit → slide_sphere @273350) ·
+`CTransition::validate_transition` pc:272547 · `CTransition::check_other_cells` pc:272717.
+
+## acdream code map (where the fix will likely go)
+`BSPQuery.StepSphereDown` (:1216) · `FindWalkableInternal` gate (:736) · `AdjustSphereToPlane`
+(:351) · `FindCollisions` StepDown dispatch (:1753) · `StepSphereUp` (:1372) · `StepUpSlide`
+(TransitionTypes.cs:472) / `SlideSphereInternal` · `DoStepUp` (:3269) / `DoStepDown` (:3089) ·
+step-up acceptance (:3147) · neg_poly dispatch gated `!StepDown && !StepUp` (:1040) ·
+`CheckOtherCells` (:1632) · `RunCheckOtherCellsAndAdvance` (:2158).
+
+## Apparatus inventory
+**TEMP probes (UNCOMMITTED in worktree, gated on `ACDREAM_PROBE_INDOOR_BSP`, marked STRIP):**
+`BSPQuery.NegPolyHitDispatch` → `[neg-poly]`; `BSPQuery.StepSphereUp` → `[stepsphereup]`;
+`Transition.CheckOtherCells` → `cn`/`sn`/`negHit` added to `[other-cells]`; `Transition.DoStepDown`
+→ `[stepdown-decide]`.
+**Existing env probes:** `ACDREAM_PROBE_INDOOR_BSP=1` (→ `[indoor-bsp]`+`[other-cells]`+the 4 TEMP),
+`ACDREAM_DUMP_STEPUP=1` (→ `stepup:`), `ACDREAM_PROBE_CELL=1` (→ `[cell-transit]`),
+`ACDREAM_PROBE_STEP_WALK=1` (→ `[step-walk]`, very high volume), `ACDREAM_CAPTURE_RESOLVE=<path>`.
+**cdb scripts:** `tools/cdb/retail-lip-trace.cdb` (carried cell — DONE), `tools/cdb/retail-flatfloor-trace.cdb`
+(v2, READY). Binary `C:\Turbine\Asheron's Call\acclient.exe` MATCHES `refs/acclient.pdb`.
+**Logs (worktree root, UTF-16/big — do NOT commit):** `acdream-corner-capture.jsonl` (321MB),
+`launch-corner-{innerflow,slidepoly,negpoly,ssu,decide}.log`, `retail-lip-trace.log`,
+`retail-flatfloor-trace.log` (artifact), `corner-cells-audit.txt`. **Analyzers:** `analyze_corner.py`.
+
+## DO NOT
+- Re-diagnose as membership / add `ResolveCellId` stickiness (RULED OUT by retail cdb).
+- Ship "set the step-down CP without adjustment" (DIVERGES from retail — verified vs decomp).
+- Use `gu` inside a cdb bp action (corrupts eax — v1 trace artifact).
+- Re-investigate B1/`slide_sphere` AS THE DOOR FIX (correct); but the cellar SLIDE RECOVERY is a
+  legitimate new suspect.
+- Flip `Apparatus_Grounded_50cmOffCenter` to `Assert.True` (synthetic-floor artifact).
+- Guess the fix — the divergence is genuinely subtle (`walk_interp`/slide-recovery), pin it first.
+
+## Test baseline
+Core 1310 pass / 4 fail / 1 skip (the 4: `Apparatus_Grounded_50cmOffCenter` [synthetic-floor],
+2× `DoorBugTrajectoryReplay LiveCompare_*` [captured-buggy-live], `BSPStepUpTests.D4` [airborne
+Path 6, separate]); App 177 green. Branch HEAD `664101f` + this session's UNCOMMITTED probes/docs.
+
+## FRESH-SESSION KICKOFF PROMPT (copy-paste)
+```
+Continue the P2 cellar-lip wedge fix for acdream. Branch claude/thirsty-goldberg-51bb9b (do NOT
+branch/worktree; do NOT push without asking; NEVER git stash/gc). PowerShell on Windows; launch
+logs are UTF-16. Use superpowers:systematic-debugging.
+
+READ FIRST (in order):
+1. docs/research/2026-06-04-p2-cellar-lip-flatfloor-cp-handoff.md  (THIS handoff — canonical).
+2. memory/project_p2_door_stepup_findings.md  (full chain: RE-DIAGNOSIS 2 + SLIDE LOCALIZED +
+   FAILING CONDITION PINNED + RETAIL trace ATTEMPT #1 entries).
+
+STATE: M1.5. The cellar "blocked at the last step, sometimes through" wedge is RE-DIAGNOSED with
+live retail cdb evidence: NOT membership (retail's carried cell flips the same way + is smooth),
+NOT a reverted landing. It IS a step-up coin-flip on the FLAT cottage floor — the step-up's
+internal step-down sets NO contact plane on the settled flat floor (cpValid=False, walkInterp=1.0)
+so the acceptance check rejects, while it works on the ramp slope. acdream's StepSphereDown +
+AdjustSphereToPlane are FAITHFUL to retail (verified vs find_walkable pc:326793 + adjust_sphere_to_plane
+pc:322032), so the obvious "set the CP anyway" fix is WRONG — retail establishes the flat-floor CP
+via a DIFFERENT path that is still unknown.
+
+THE JOB (evidence-first; do NOT guess):
+1. Run the READY v2 retail trace tools/cdb/retail-flatfloor-trace.cdb (user relaunches the retail
+   client + walks to the cellar lip; STEP 0 = verify the +0x218/+0x227 return offsets against the
+   `u` disassembly the script logs BEFORE driving; NO `gu` in bp actions). Answer: does retail's
+   step_sphere_down set the CP (ret 3) or not (ret 1) at floor cell 0xA9B40171?
+2. If mostly NO-CP → trace COLLISIONINFO::set_contact_plane callers (poi(@esp)) for normal≈(0,0,1)
+   to find retail's flat-floor CP path; port it. If mostly SET-CP → the divergence is in acdream's
+   StepSphereDown/AdjustSphereToPlane walk_interp/t math vs ACE. Leading hypothesis: retail's
+   step-up also "fails" on the flat floor but RECOVERS via step_up_slide smoothly where acdream
+   wedges → the divergence may be the SLIDE RECOVERY (StepUpSlide/SlideSphereInternal) +
+   connector-0175 StepSphereUp interference, NOT the CP.
+3. RED→GREEN deterministic test + STRIP the 4 TEMP probes once the fix lands. USER VISUAL GATE:
+   cellar ascent clean (no last-step wedge); inn door still BLOCKS; generic step-up climbs.
+
+DO NOT: re-diagnose as membership / add ResolveCellId stickiness; ship "set the step-down CP
+without adjust" (diverges from retail); use `gu` in a cdb bp action; guess.
+
+TEST BASELINE: Core 1310 pass / 4 fail / 1 skip (documented); App 177 green. Branch HEAD 664101f +
+UNCOMMITTED TEMP probes (BSPQuery.NegPolyHitDispatch [neg-poly], BSPQuery.StepSphereUp
+[stepsphereup], CheckOtherCells cn/sn/negHit, DoStepDown [stepdown-decide]) gated on
+ACDREAM_PROBE_INDOOR_BSP.
+```

src/AcDream.Core/Physics/BSPQuery.cs

@@ -1374,10 +1374,27 @@ public static class BSPQuery
         Vector3       collisionNormal,
         PhysicsEngine engine)
     {
-        if (transition.DoStepUp(collisionNormal, engine!))
+        bool stepped = transition.DoStepUp(collisionNormal, engine!);
+
+        // TEMP diagnostic (cellar-lip wedge, 2026-06-04): this is the suspected
+        // recursive step-up onto the CONNECTOR cell during the outer check_other_cells
+        // (StepUp/StepDown both false). Log which cell, the input normal, whether the
+        // climb succeeded, and the slide fallback's result. STRIP once the wedge fix lands.
+        if (PhysicsDiagnostics.ProbeIndoorBspEnabled)
+        {
+            var p = transition.SpherePath;
+            Console.WriteLine(System.FormattableString.Invariant(
+                $"[stepsphereup] cell=0x{p.CheckCellId:X8} stepUpFlag={p.StepUp} stepDownFlag={p.StepDown} n=({collisionNormal.X:F2},{collisionNormal.Y:F2},{collisionNormal.Z:F2}) stepped={stepped} pos=({p.CheckPos.X:F3},{p.CheckPos.Y:F3},{p.CheckPos.Z:F3})"));
+        }
+
+        if (stepped)
             return TransitionState.OK;
 
-        return transition.SpherePath.StepUpSlide(transition);
+        var slideRes = transition.SpherePath.StepUpSlide(transition);
+        if (PhysicsDiagnostics.ProbeIndoorBspEnabled)
+            Console.WriteLine(System.FormattableString.Invariant(
+                $"[stepsphereup] cell=0x{transition.SpherePath.CheckCellId:X8} → StepUpSlide={slideRes}"));
+        return slideRes;
     }
 
     // -------------------------------------------------------------------------
@@ -1494,6 +1511,17 @@ public static class BSPQuery
         path.NegStepUp        = stepUp;
         // ACE: path.LocalSpacePos.LocalToGlobalVec(hitPoly.Plane.Normal)
         path.NegCollisionNormal = Vector3.Transform(hitPoly.Plane.Normal, localToWorld);
+
+        // TEMP diagnostic (cellar-lip wedge, 2026-06-04): name the exact near-miss
+        // polygon (id + local normal + sides) + the foot/head mapping (stepUp) + the
+        // step-down flag, so we can tell which connector poly the step-up grazes.
+        // Gated on ACDREAM_PROBE_INDOOR_BSP. STRIP once the wedge fix lands.
+        if (PhysicsDiagnostics.ProbeIndoorBspEnabled)
+        {
+            var nl = hitPoly.Plane.Normal;
+            Console.WriteLine(System.FormattableString.Invariant(
+                $"[neg-poly] cell=0x{path.CheckCellId:X8} stepUp={stepUp} stepDownFlag={path.StepDown} poly=0x{hitPoly.Id:X4} nLocal=({nl.X:F3},{nl.Y:F3},{nl.Z:F3}) sides={hitPoly.SidesType} checkPos=({path.CheckPos.X:F3},{path.CheckPos.Y:F3},{path.CheckPos.Z:F3})"));
+        }
         return TransitionState.OK;
     }
 

src/AcDream.Core/Physics/TransitionTypes.cs

@@ -1742,7 +1742,7 @@ public sealed class Transition
                 string bsDesc = System.FormattableString.Invariant(
                     $"bs=({bs.Origin.X:F3},{bs.Origin.Y:F3},{bs.Origin.Z:F3}) br={bs.Radius:F3}");
                 Console.WriteLine(System.FormattableString.Invariant(
-                    $"[other-cells] primary=0x{sp.CheckCellId:X8} iter=0x{cellId:X8} wpos=({footCenter.X:F3},{footCenter.Y:F3},{footCenter.Z:F3}) lpos=({localCenter.X:F3},{localCenter.Y:F3},{localCenter.Z:F3}) lprev=({localCurrCenter.X:F3},{localCurrCenter.Y:F3},{localCurrCenter.Z:F3}) r={sphereRadius:F3} {bsDesc} result={result} {polyDesc}"));
+                    $"[other-cells] primary=0x{sp.CheckCellId:X8} iter=0x{cellId:X8} wpos=({footCenter.X:F3},{footCenter.Y:F3},{footCenter.Z:F3}) lpos=({localCenter.X:F3},{localCenter.Y:F3},{localCenter.Z:F3}) lprev=({localCurrCenter.X:F3},{localCurrCenter.Y:F3},{localCurrCenter.Z:F3}) r={sphereRadius:F3} {bsDesc} result={result} cn=({CollisionInfo.CollisionNormal.X:F2},{CollisionInfo.CollisionNormal.Y:F2},{CollisionInfo.CollisionNormal.Z:F2}) sn=({CollisionInfo.SlidingNormal.X:F2},{CollisionInfo.SlidingNormal.Y:F2},{CollisionInfo.SlidingNormal.Z:F2}) negHit={sp.NegPolyHit} negN=({sp.NegCollisionNormal.X:F2},{sp.NegCollisionNormal.Y:F2},{sp.NegCollisionNormal.Z:F2}) {polyDesc}"));
             }
 
             if (PhysicsDiagnostics.ProbeStepWalkEnabled
@@ -3134,6 +3134,22 @@ public sealed class Transition
 
         sp.StepDown = false;
 
+        // TEMP diagnostic (cellar-lip wedge, 2026-06-04): why does the lip-riser
+        // step-up flip ~50/50? Log the step-down DECISION inputs — the
+        // TransitionalInsert(5) result, contact-plane validity + Z-normal, the
+        // walkable threshold, and WalkInterp. On the FAILING half exactly one of
+        // these explains the rejection. Gated on ACDREAM_PROBE_INDOOR_BSP. STRIP
+        // once the wedge fix lands.
+        if (PhysicsDiagnostics.ProbeIndoorBspEnabled)
+        {
+            var cpn = CollisionInfo.ContactPlane.Normal;
+            bool accept = transitState == TransitionState.OK
+                          && CollisionInfo.ContactPlaneValid
+                          && cpn.Z >= walkableZ;
+            Console.WriteLine(System.FormattableString.Invariant(
+                $"[stepdown-decide] cell=0x{sp.CheckCellId:X8} insert={transitState} cpValid={CollisionInfo.ContactPlaneValid} cpNz={cpn.Z:F3} walkableZ={walkableZ:F3} walkInterp={sp.WalkInterp:F3} accept={accept} pos=({sp.CheckPos.X:F3},{sp.CheckPos.Y:F3},{sp.CheckPos.Z:F3})"));
+        }
+
         // Accept step-down if:
         //   1. Collision detection returned OK
         //   2. A valid contact plane was found

tests/AcDream.Core.Tests/Fixtures/cellar-lip/0xA9B40174.json

@@ -0,0 +1,583 @@
+{
+  "CellId": 2847146356,
+  "WorldTransform": {
+    "M11": -1,
+    "M12": 8.74228E-08,
+    "M13": 0,
+    "M14": 0,
+    "M21": -8.74228E-08,
+    "M22": -1,
+    "M23": 0,
+    "M24": 0,
+    "M31": 0,
+    "M32": 0,
+    "M33": 1,
+    "M34": 0,
+    "M41": 161.929,
+    "M42": 7.50315,
+    "M43": 94,
+    "M44": 1
+  },
+  "InverseWorldTransform": {
+    "M11": -1,
+    "M12": -8.74228E-08,
+    "M13": 0,
+    "M14": -0,
+    "M21": 8.74228E-08,
+    "M22": -1,
+    "M23": 0,
+    "M24": 0,
+    "M31": 0,
+    "M32": 0,
+    "M33": 1,
+    "M34": -0,
+    "M41": 161.929,
+    "M42": 7.5031643,
+    "M43": -94,
+    "M44": 1
+  },
+  "ResolvedPolygons": [
+    {
+      "Id": 0,
+      "NumPoints": 4,
+      "SidesType": 0,
+      "Plane": {
+        "Normal": {
+          "X": 0,
+          "Y": 0,
+          "Z": 1
+        },
+        "D": 3.999
+      },
+      "Vertices": [
+        {
+          "X": 9,
+          "Y": -2.85,
+          "Z": -3.999
+        },
+        {
+          "X": 9,
+          "Y": 2.98,
+          "Z": -3.999
+        },
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tests/AcDream.Core.Tests/Physics/CellarLipWedgeTests.cs

@@ -0,0 +1,446 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Numerics;
+using AcDream.Core.Physics;
+using DatReaderWriter.Enums;
+using DatReaderWriter.Types;
+using Xunit;
+
+namespace AcDream.Core.Tests.Physics;
+
+/// <summary>
+/// P2 cellar-LIP wedge (2026-06-04) — deterministic reproduction of the
+/// "blocked at the last step" wedge at the Holtburg cottage cellar lip,
+/// distinct from the earlier issue-#98 cellar (cells 0xA9B4014X).
+///
+/// <para>
+/// Built from live captures this session:
+/// <list type="bullet">
+///   <item><b>Retail-connector trace</b> (CEnvCell::find_collisions) proved
+///         retail's connector cell <c>0xA9B40175</c> NEVER blocks (2692 OK +
+///         94 Adjusted + 0 Collided + 0 Slid over ~85K samples).</item>
+///   <item><b>acdream live capture</b> at the wedge: the player (r=0.48 body
+///         sphere) is mid-climb at world Z=93.936, carried in the 0.364 m-tall
+///         threshold slab <c>0xA9B40175</c>. Its 0.48 sphere grazes the slab's
+///         −X wall (local X=9; sphere at X=8.523 reaches 9.003 — a 3 mm graze)
+///         → <c>StepSphereUp</c> → <c>DoStepUp</c> fails (no CP on the flat
+///         cottage floor) → <c>StepUpSlide</c> returns <c>Collided</c> → the
+///         per-cell collide returns Collided → wedge.</item>
+/// </list>
+/// </para>
+///
+/// <para>
+/// Fixtures are real cell dumps (<c>ACDREAM_DUMP_CELLS</c>) of the three lip
+/// cells: <c>0xA9B40171</c> (cottage floor), <c>0xA9B40174</c>, <c>0xA9B40175</c>
+/// (threshold connector). The <c>BSP=null</c> hydration gap is bridged with a
+/// synthetic single-leaf BSP, same as <see cref="CellarUpTrajectoryReplayTests"/>.
+/// </para>
+///
+/// <para>
+/// <b>RED status:</b> the climb-advance assertion is expected to FAIL while the
+/// wedge exists (the player freezes at the threshold ~Z=93.94 instead of
+/// reaching the cottage floor ~Z=94.48). When the fix lands it flips to GREEN.
+/// </para>
+/// </summary>
+public class CellarLipWedgeTests
+{
+    private const uint CottageFloorId = 0xA9B40171u;   // cottage room floor
+    private const uint Connector74Id  = 0xA9B40174u;
+    private const uint ThresholdId    = 0xA9B40175u;   // 0.364 m threshold slab
+
+    // Player physics from PlayerMovementController.cs (human, from Setup).
+    private const float SphereRadius   = 0.48f;
+    private const float SphereHeight   = 1.20f;
+    private const float StepUpHeight   = 0.40f;
+    private const float StepDownHeight = 0.04f;
+
+    // The live-captured wedge state. The probe's [indoor-bsp] wpos is the
+    // FOOT-SPHERE CENTER (153.406, 9.754, 93.936); the engine body Position is
+    // the foot BOTTOM = center − radius = Z 93.456. Player carried in the
+    // 0.364 m threshold slab 0xA9B40175, climbing the cellar stairs; observed
+    // motion at the lip is world −Y (into the cottage).
+    private static readonly Vector3 WedgeSphereCenter = new(153.406f, 9.754f, 93.936f);
+    private static readonly Vector3 WedgeBodyPos =
+        new(153.406f, 9.754f, 93.936f - SphereRadius);   // foot bottom Z=93.456
+    private static readonly Vector3 PerTickOffset = new(0f, -0.10f, 0f);
+
+    private const float CottageFloorZ   = 94.00f;
+    private const float RestOnCottageZ  = CottageFloorZ + SphereRadius; // ≈94.48
+
+    /// <summary>
+    /// Diagnostic: drive the player off the threshold toward the cottage and
+    /// dump the trajectory + indoor-BSP/step probes. Always passes; the
+    /// captured stdout shows exactly what the engine does each tick.
+    /// </summary>
+    [Fact]
+    public void Diagnostic_DriveOffThreshold_DumpTrajectory()
+    {
+        PhysicsDiagnostics.ProbeResolveEnabled    = true;
+        PhysicsDiagnostics.ProbeIndoorBspEnabled  = true;
+        var saved = Console.Out;
+        var sw = new StringWriter();
+        Console.SetOut(sw);
+        try
+        {
+            var engine = BuildEngineWithLipFixtures();
+            var body   = BuildWedgeBody();
+            var traj   = SimulateTicks(engine, body, ThresholdId, 4);
+
+            Console.SetOut(saved);
+            var probeLines = sw.ToString();
+            File.WriteAllText(
+                Path.Combine(Path.GetTempPath(), "lip-wedge-diag.log"),
+                "TRAJECTORY:\n" + string.Join("\n", traj.Select(p =>
+                    $"tick={p.Tick} pos=({p.Position.X:F4},{p.Position.Y:F4},{p.Position.Z:F4}) " +
+                    $"cell=0x{p.CellId:X8} onGround={p.IsOnGround} cpValid={p.CpValid}")) +
+                "\n\nPROBES:\n" + probeLines);
+            Assert.True(true);
+        }
+        finally
+        {
+            Console.SetOut(saved);
+            PhysicsDiagnostics.ProbeResolveEnabled   = false;
+            PhysicsDiagnostics.ProbeIndoorBspEnabled = false;
+        }
+    }
+
+    /// <summary>
+    /// DOCUMENTS-THE-BUG (passes while the wedge exists; FAILS when the fix
+    /// lands). Seeded at the live wedge position (foot-sphere center Z=93.936,
+    /// carried in the 0.364 m threshold slab 0xA9B40175) and driven forward,
+    /// the player FREEZES — blocked by the slab's −X side wall (poly normal
+    /// world (1,0,0)) — instead of advancing onto the cottage floor. Retail's
+    /// 0175 never blocks (live CEnvCell::find_collisions trace: 0 Collided/Slid).
+    ///
+    /// <para>
+    /// <b>Faithfulness caveat:</b> the per-tick drive direction (world −Y) is an
+    /// approximation — the exact <c>targetPos</c> would come from an
+    /// <c>ACDREAM_CAPTURE_RESOLVE</c> JSONL of the live wedge. The −Y drive is
+    /// PARALLEL to the −X wall, so it reproduces the block but may not be the
+    /// real climb path. A candidate fix (replacing the A6.P4 neg-poly
+    /// "return Collided" shortcut with retail's slide_sphere) did NOT clear this:
+    /// the slide returns Slid with offset=0 (displacement already along the
+    /// crease), the loop re-checks with gDelta≈0 → SlideSphere's
+    /// offset.LengthSquared&lt;ε → Collided branch → revert. The real fix needs a
+    /// faithful repro + the slide/loop-commit investigation (see the handoff
+    /// doc 2026-06-04-p2-cellar-lip-flatfloor-cp-handoff.md, Correction 2).
+    /// </para>
+    ///
+    /// When the wedge is fixed the player advances and this assertion FAILS —
+    /// that is the signal to flip it to assert the climb.
+    /// </summary>
+    [Fact]
+    public void DocumentsWedge_PlayerFrozenAtThreshold_BlockedByMinusXWall()
+    {
+        var engine = BuildEngineWithLipFixtures();
+        var body   = BuildWedgeBody();
+        var traj   = SimulateTicks(engine, body, ThresholdId, 30);
+
+        var final = traj[^1];
+        float yAdvance = WedgeBodyPos.Y - final.Position.Y;   // +ve = moved into cottage
+        float zRise    = final.Position.Z - WedgeBodyPos.Z;   // +ve = climbed
+
+        Assert.True(
+            yAdvance < 0.1f && zRise < 0.1f,
+            $"DOCUMENTS-THE-BUG: expected the player to be FROZEN at the threshold " +
+            $"(the −X-wall wedge). Instead it advanced to " +
+            $"({final.Position.X:F3},{final.Position.Y:F3},{final.Position.Z:F3}) " +
+            $"after 30 ticks (yAdvance={yAdvance:F3}, zRise={zRise:F3}). If the wedge " +
+            $"fix landed, FLIP this assertion to require the climb " +
+            $"(Z≥{CottageFloorZ - 0.05f:F2}, yAdvance>0.5).");
+    }
+
+    // ───────────────────────────── helpers ─────────────────────────────
+
+    private static PhysicsBody BuildWedgeBody() => new()
+    {
+        Position           = WedgeBodyPos,           // foot bottom Z=93.456
+        Orientation        = Quaternion.Identity,
+
+        // Best-effort grounded seed: a flat floor at foot level so the player
+        // starts "on the ground" mid-climb (the exact body-before state would
+        // come from an ACDREAM_CAPTURE_RESOLVE JSONL; this approximation puts
+        // the foot-sphere center at Z=93.936 — the live wedge — so the
+        // geometric −X-wall full-hit fires).
+        ContactPlaneValid    = true,
+        ContactPlane         = new System.Numerics.Plane(0f, 0f, 1f, -WedgeBodyPos.Z),
+        ContactPlaneCellId   = ThresholdId,
+        WalkablePolygonValid = true,
+        WalkablePlane        = new System.Numerics.Plane(0f, 0f, 1f, -WedgeBodyPos.Z),
+        WalkableVertices     = new[]
+        {
+            new Vector3(WedgeBodyPos.X - 1f, WedgeBodyPos.Y - 1f, WedgeBodyPos.Z),
+            new Vector3(WedgeBodyPos.X - 1f, WedgeBodyPos.Y + 1f, WedgeBodyPos.Z),
+            new Vector3(WedgeBodyPos.X + 1f, WedgeBodyPos.Y + 1f, WedgeBodyPos.Z),
+            new Vector3(WedgeBodyPos.X + 1f, WedgeBodyPos.Y - 1f, WedgeBodyPos.Z),
+        },
+        WalkableUp           = Vector3.UnitZ,
+        TransientState       = TransientStateFlags.Contact | TransientStateFlags.OnWalkable,
+    };
+
+    private static List<TrajPoint> SimulateTicks(
+        PhysicsEngine engine, PhysicsBody body, uint initialCellId, int tickCount)
+    {
+        uint cellId     = initialCellId;
+        bool isOnGround  = true;
+        var traj = new List<TrajPoint> { new(0, body.Position, cellId, isOnGround, body.ContactPlaneValid) };
+
+        for (int tick = 1; tick <= tickCount; tick++)
+        {
+            Vector3 target = body.Position + PerTickOffset;
+            var result = engine.ResolveWithTransition(
+                currentPos:     body.Position,
+                targetPos:      target,
+                cellId:         cellId,
+                sphereRadius:   SphereRadius,
+                sphereHeight:   SphereHeight,
+                stepUpHeight:   StepUpHeight,
+                stepDownHeight: StepDownHeight,
+                isOnGround:     isOnGround,
+                body:           body,
+                moverFlags:     ObjectInfoState.IsPlayer | ObjectInfoState.EdgeSlide,
+                movingEntityId: 0);
+
+            body.Position = result.Position;
+            cellId        = result.CellId;
+            isOnGround    = result.IsOnGround;
+            traj.Add(new(tick, body.Position, cellId, isOnGround, body.ContactPlaneValid));
+        }
+        return traj;
+    }
+
+    private sealed record TrajPoint(int Tick, Vector3 Position, uint CellId, bool IsOnGround, bool CpValid);
+
+    // ─────────────────────── faithful live-wedge replay ───────────────────────
+    // Replays a captured wedge ResolveWithTransition call (exact currentPos /
+    // targetPos / body-before from ACDREAM_CAPTURE_RESOLVE at the live cellar
+    // lip) through the lip-cell engine. The live climb direction is −X,+Y (the
+    // synthetic −Y guess was backwards). 29 representative wedge records are in
+    // Fixtures/cellar-lip/wedge-records.jsonl.
+
+    private static readonly System.Text.Json.JsonSerializerOptions WedgeJsonOptions =
+        new() { IncludeFields = true, PropertyNamingPolicy = System.Text.Json.JsonNamingPolicy.CamelCase };
+
+    private static List<ResolveCaptureRecord> LoadWedgeRecords()
+    {
+        var path = Path.Combine(FixtureDir, "wedge-records.jsonl");
+        Assert.True(File.Exists(path), $"Wedge fixture missing: {path}");
+        var list = new List<ResolveCaptureRecord>();
+        foreach (var line in File.ReadLines(path))
+        {
+            if (string.IsNullOrWhiteSpace(line)) continue;
+            list.Add(System.Text.Json.JsonSerializer.Deserialize<ResolveCaptureRecord>(line, WedgeJsonOptions)!);
+        }
+        return list;
+    }
+
+    private static PhysicsBody SeedBody(PhysicsBodySnapshot s) => new()
+    {
+        Position             = s.Position,
+        Orientation          = s.Orientation,
+        Velocity             = s.Velocity,
+        Acceleration         = s.Acceleration,
+        Omega                = s.Omega,
+        GroundNormal         = s.GroundNormal,
+        SlidingNormal        = s.SlidingNormal,
+        ContactPlaneValid    = s.ContactPlaneValid,
+        ContactPlane         = s.ContactPlane,
+        ContactPlaneCellId   = s.ContactPlaneCellId,
+        ContactPlaneIsWater  = s.ContactPlaneIsWater,
+        WalkablePolygonValid = s.WalkablePolygonValid,
+        WalkablePlane        = s.WalkablePlane,
+        WalkableVertices     = s.WalkableVertices,
+        WalkableUp           = s.WalkableUp,
+        Elasticity           = s.Elasticity,
+        Friction             = s.Friction,
+        State                = (PhysicsStateFlags)s.State,
+        TransientState       = (TransientStateFlags)s.TransientState,
+        LastUpdateTime       = s.LastUpdateTime,
+    };
+
+    private static (Vector3 res, float requested, float advance) ReplayRecord(ResolveCaptureRecord rec)
+    {
+        var engine = BuildEngineWithLipFixtures();
+        var body   = SeedBody(rec.BodyBefore!);
+        var result = engine.ResolveWithTransition(
+            currentPos:     rec.Input.CurrentPos,
+            targetPos:      rec.Input.TargetPos,
+            cellId:         rec.Input.CellId,
+            sphereRadius:   rec.Input.SphereRadius,
+            sphereHeight:   rec.Input.SphereHeight,
+            stepUpHeight:   rec.Input.StepUpHeight,
+            stepDownHeight: rec.Input.StepDownHeight,
+            isOnGround:     rec.Input.IsOnGround,
+            body:           body,
+            moverFlags:     (ObjectInfoState)rec.Input.MoverFlags,
+            movingEntityId: rec.Input.MovingEntityId);
+        float requested = Vector3.Distance(rec.Input.CurrentPos, rec.Input.TargetPos);
+        float advance   = Vector3.Distance(rec.Input.CurrentPos, result.Position);
+        return (result.Position, requested, advance);
+    }
+
+    /// <summary>
+    /// Diagnostic: replay every captured wedge record and report advance% — to
+    /// confirm the lip-cell engine reproduces the live stuck (0% advance) before
+    /// asserting a fix. Always passes; results in the message + %TEMP% file.
+    /// </summary>
+    [Fact]
+    public void Diagnostic_ReplayLiveWedgeRecords_Advance()
+    {
+        var recs = LoadWedgeRecords();
+        var lines = new List<string>();
+        foreach (var (rec, i) in recs.Select((r, i) => (r, i)))
+        {
+            if (rec.BodyBefore is null) continue;
+            var (res, req, adv) = ReplayRecord(rec);
+            var cpN = rec.BodyBefore.ContactPlane.Normal;
+            lines.Add($"#{i} cp=({cpN.X:F2},{cpN.Y:F2},{cpN.Z:F2}) req={req:F3} adv={adv:F3} ({(req>0?100*adv/req:0):F0}%) " +
+                      $"cur=({rec.Input.CurrentPos.X:F2},{rec.Input.CurrentPos.Y:F2},{rec.Input.CurrentPos.Z:F2}) " +
+                      $"tgt=({rec.Input.TargetPos.X:F2},{rec.Input.TargetPos.Y:F2},{rec.Input.TargetPos.Z:F2}) " +
+                      $"res=({res.X:F2},{res.Y:F2},{res.Z:F2})");
+        }
+        File.WriteAllText(Path.Combine(Path.GetTempPath(), "lip-wedge-replay.log"), string.Join("\n", lines));
+        Assert.True(true, string.Join("\n", lines.Take(10)));
+    }
+
+    /// <summary>
+    /// Diagnostic: replay ONE floor-CP wedge record with the step-up + indoor
+    /// probes on, capturing why the step-up fails. Output to %TEMP%/lip-wedge-stepup.log.
+    /// </summary>
+    [Fact]
+    public void Diagnostic_ReplayFloorCpRecord_StepUpProbes()
+    {
+        var rec = LoadWedgeRecords().First(r => r.BodyBefore is not null
+                                             && r.BodyBefore.ContactPlane.Normal.Z > 0.99f);
+        var saved = Console.Out;
+        var sw = new StringWriter();
+        PhysicsDiagnostics.ProbeIndoorBspEnabled = true;
+        PhysicsDiagnostics.ProbeStepWalkEnabled  = true;
+        Environment.SetEnvironmentVariable("ACDREAM_DUMP_STEPUP", "1");
+        Console.SetOut(sw);
+        try
+        {
+            var (res, req, adv) = ReplayRecord(rec);
+            Console.SetOut(saved);
+            File.WriteAllText(Path.Combine(Path.GetTempPath(), "lip-wedge-stepup.log"),
+                $"record cur=({rec.Input.CurrentPos.X:F4},{rec.Input.CurrentPos.Y:F4},{rec.Input.CurrentPos.Z:F4}) " +
+                $"tgt=({rec.Input.TargetPos.X:F4},{rec.Input.TargetPos.Y:F4},{rec.Input.TargetPos.Z:F4}) " +
+                $"req={req:F3} adv={adv:F3} res=({res.X:F4},{res.Y:F4},{res.Z:F4})\n\n" + sw.ToString());
+            Assert.True(true);
+        }
+        finally
+        {
+            Console.SetOut(saved);
+            Environment.SetEnvironmentVariable("ACDREAM_DUMP_STEPUP", null);
+            PhysicsDiagnostics.ProbeIndoorBspEnabled = false;
+            PhysicsDiagnostics.ProbeStepWalkEnabled  = false;
+        }
+    }
+
+    /// <summary>
+    /// FAITHFUL documents-the-bug (passes while the wedge exists; FAILS when the
+    /// fix lands → flip to assert the climb). Replays a captured FLOOR-contact-
+    /// plane wedge through the lip-cell engine; the player is STUCK (0% advance).
+    ///
+    /// <para>
+    /// <b>Root cause (traced via <c>Diagnostic_ReplayFloorCpRecord_StepUpProbes</c>):</b>
+    /// the player is at the doorway EDGE of the cottage floor (0171, poly 0x0023,
+    /// Z=94). The step-up's step-down finds that floor and the 0.48 sphere
+    /// OVERLAPS it (0.085 m below), but acdream's walkable check REJECTS it
+    /// because the sphere center projects outside the floor poly's edge
+    /// (<c>insideEdges=False</c>, <c>gap=−0.395</c>) → no contact plane → step-up
+    /// fails → StepUpSlide=Collided. Retail accepts the floor at its edge and
+    /// crosses (0175 never blocks). Fix is in the walkable-edge acceptance
+    /// (WalkableHitsSphere / PolygonHitsSpherePrecise / CheckWalkable edge math)
+    /// — compare retail CPolygon::walkable_hits_sphere + check_walkable. DOOR
+    /// REGRESSION RISK: walkable changes are global; visual-gate + door tests.
+    /// </para>
+    /// </summary>
+    [Fact]
+    public void DocumentsWedge_LiveFloorCp_PlayerStuckAtCottageFloorEdge()
+    {
+        var recs = LoadWedgeRecords();
+        var rec  = recs.First(r => r.BodyBefore is not null
+                                && r.BodyBefore.ContactPlane.Normal.Z > 0.99f);
+        var (res, requested, advance) = ReplayRecord(rec);
+        var c = rec.Input.CurrentPos; var t = rec.Input.TargetPos;
+        Assert.True(advance < 0.1f * requested,
+            $"DOCUMENTS-THE-BUG: expected the player STUCK at the cottage-floor edge. " +
+            $"Instead it advanced: cur=({c.X:F3},{c.Y:F3},{c.Z:F3}) tgt=({t.X:F3},{t.Y:F3},{t.Z:F3}) " +
+            $"res=({res.X:F3},{res.Y:F3},{res.Z:F3}) requested={requested:F3} advance={advance:F3}. " +
+            $"If the walkable-edge fix landed, FLIP this to require advance>0.25·requested.");
+    }
+
+    private static PhysicsEngine BuildEngineWithLipFixtures()
+    {
+        var cache  = new PhysicsDataCache();
+        var engine = new PhysicsEngine { DataCache = cache };
+
+        foreach (var cellId in new[] { CottageFloorId, Connector74Id, ThresholdId })
+        {
+            var path = Path.Combine(FixtureDir, $"0x{cellId:X8}.json");
+            Assert.True(File.Exists(path), $"Lip fixture missing: {path}");
+            var dump = CellDumpSerializer.Read(path);
+            var cell = CellDumpSerializer.Hydrate(dump);
+            cache.RegisterCellStructForTest(cellId, AttachSyntheticBsp(cell));
+        }
+
+        // Empty-terrain landblock so FindObjCollisions' TryGetLandblockContext
+        // succeeds at the lip XY (X≈153, Y≈9). Flat far-below surface; the
+        // indoor BSP path fires first so terrain is never consulted.
+        var heights     = new byte[81];
+        var heightTable = new float[256];
+        for (int i = 0; i < 256; i++) heightTable[i] = -1000f;
+        engine.AddLandblock(
+            landblockId:  0xA9B40000u,
+            terrain:      new TerrainSurface(heights, heightTable),
+            cells:        Array.Empty<CellSurface>(),
+            portals:      Array.Empty<PortalPlane>(),
+            worldOffsetX: 0f,
+            worldOffsetY: 0f);
+
+        return engine;
+    }
+
+    private static CellPhysics AttachSyntheticBsp(CellPhysics cell)
+    {
+        var leaf = new PhysicsBSPNode
+        {
+            Type = BSPNodeType.Leaf,
+            BoundingSphere = new Sphere { Origin = new Vector3(0f, 0f, 0f), Radius = 15f },
+        };
+        foreach (var kv in cell.Resolved)
+            leaf.Polygons.Add(kv.Key);
+
+        return new CellPhysics
+        {
+            BSP                   = new PhysicsBSPTree { Root = leaf },
+            PhysicsPolygons       = cell.PhysicsPolygons,
+            Vertices              = cell.Vertices,
+            WorldTransform        = cell.WorldTransform,
+            InverseWorldTransform = cell.InverseWorldTransform,
+            Resolved              = cell.Resolved,
+            CellBSP               = cell.CellBSP,
+            Portals               = cell.Portals,
+            PortalPolygons        = cell.PortalPolygons,
+            VisibleCellIds        = cell.VisibleCellIds,
+        };
+    }
+
+    private static string FixtureDir =>
+        Path.Combine(SolutionRoot(), "tests", "AcDream.Core.Tests", "Fixtures", "cellar-lip");
+
+    private static string SolutionRoot()
+    {
+        var dir = AppContext.BaseDirectory;
+        while (!string.IsNullOrEmpty(dir))
+        {
+            if (File.Exists(Path.Combine(dir, "AcDream.slnx")))
+                return dir;
+            dir = Path.GetDirectoryName(dir);
+        }
+        throw new InvalidOperationException("Could not locate solution root (AcDream.slnx).");
+    }
+}

tools/cdb/retail-connector-collide-trace.cdb

@@ -0,0 +1,34 @@
+$$ Retail per-cell collide trace (2026-06-04 — the DECISIVE discriminator).
+$$
+$$ Question: when retail crosses the cellar lip, what does the per-cell collide
+$$ CEnvCell::find_collisions RETURN for the connector cell 0xA9B40175 and the floor
+$$ cell 0xA9B40171 (and 0174)?  This is the thing check_other_cells calls per cell
+$$ (vtable[0x88]).  enum: 1=OK 2=COLLIDED 3=ADJUSTED 4=SLID.
+$$
+$$   - If 0175 returns mostly 1 (OK)  -> acdream's connector Slid is SPURIOUS
+$$     (acdream over-detects / over-steps-up 0175).  Fix = stop acdream blocking 0175.
+$$   - If 0175 returns 4 (SLID) too   -> retail slides+continues (no revert);
+$$     acdream's wedge is the substep REVERT, not the collide.  Look upstream.
+$$
+$$ ROBUST BY CONSTRUCTION (verified offline via `cdb -z acclient.exe`):
+$$   CEnvCell::find_collisions @0x52c100 has a SINGLE exit at +0x1e (0x52c11e):
+$$     0052c11e pop edi      <-- esi still = this (CEnvCell*), eax = result
+$$     0052c11f pop esi
+$$     0052c120 ret 4
+$$   cell id = poi(esi+0x28) (CEnvCell.m_DID).  No `gu`, no `qd` in the action.
+$$   Reading this+result directly at the single exit is nesting-safe.
+$$
+$$ STEP 0 (optional re-verify): the `uf` below re-dumps the function; confirm the
+$$ single exit is still at +0x1e and esi=this there, before driving.
+$$
+$$ Close retail when done to detach cdb (debuggee exit detaches; no qd needed).
+.logopen C:\Users\erikn\source\repos\acdream\.claude\worktrees\thirsty-goldberg-51bb9b\retail-connector-collide-trace.log
+.sympath C:\Users\erikn\source\repos\acdream\refs
+.symopt+ 0x40
+.reload /f acclient.exe
+uf acclient!CEnvCell::find_collisions
+$$ Log EVERY return for the lip cluster 0xA9B4017X (0171 floor / 0174 / 0175 connector).
+$$ Also log any NON-OK (ret!=1) return for ANY Holtburg cell 0xA9B4xxxx (catch blocks
+$$ outside the 017X cluster).  Low volume; cheap action + gc.
+bp acclient!CEnvCell::find_collisions+0x1e ".if ((poi(@esi+0x28) & 0xFFFFFFF0) == 0xA9B40170) { .printf \"lip cell=0x%x ret=%d\\n\", poi(@esi+0x28), @eax } .elsif (((poi(@esi+0x28) & 0xFFFF0000) == 0xA9B40000) & (@eax != 1)) { .printf \"blk cell=0x%x ret=%d\\n\", poi(@esi+0x28), @eax }; gc"
+g

tools/cdb/retail-flatfloor-trace.cdb

@@ -0,0 +1,26 @@
+$$ Retail flat-floor contact-plane trace (2026-06-04, v2 — CORRECTED).
+$$ Decisive question: when retail lands on the FLAT cottage floor during the climb, does
+$$ BSPTREE::step_sphere_down SET the contact plane (return 3) or NOT (return 1)?
+$$
+$$ v1 (gu-in-bp-action) FAILED: "commands skipped ... target execution inside an event
+$$ handler" corrupted eax -> a perfect 1,3,1,3 alternation artifact. DO NOT use `gu` in a
+$$ bp action. v2: stash the carried cell in $t3 at ENTRY (arg2 = sphere_path at [esp+4],
+$$ before the prologue), then break at the TWO RETURN addresses and print SET/NO + $t3.
+$$
+$$ STEP 0 (do this FIRST, before driving): the +0x218 (return 3) / +0x227 (return 1) offsets
+$$ below are from the decomp (step_sphere_down @0x53a210; return 3 @0x53a428; return 1 @0x53a437)
+$$ and MUST be verified against the live binary. After attaching, read the log: the `u` output
+$$ (below) disassembles the function — confirm which addresses load eax=3 vs eax=1 (or jmp to the
+$$ shared epilogue) and FIX the two `bp ...+0xNNN` offsets if they differ, then re-attach.
+$$
+$$ No qd / no Stop-Process needed if the user closes retail (debuggee exit detaches cdb).
+.logopen C:\Users\erikn\source\repos\acdream\.claude\worktrees\thirsty-goldberg-51bb9b\retail-flatfloor-trace.log
+.sympath C:\Users\erikn\source\repos\acdream\refs
+.symopt+ 0x40
+.reload /f acclient.exe
+u acclient!BSPTREE::step_sphere_down L90
+r @$t3 = 0
+bp acclient!BSPTREE::step_sphere_down "r @$t3 = @@c++(((acclient!SPHEREPATH *)poi(@esp+4))->check_pos.objcell_id); gc"
+bp acclient!BSPTREE::step_sphere_down+0x218 ".printf \"SET-CP cell=0x%x\\n\", @$t3; gc"
+bp acclient!BSPTREE::step_sphere_down+0x227 ".printf \"NO-CP cell=0x%x\\n\", @$t3; gc"
+g

tools/cdb/retail-lip-trace.cdb

@@ -0,0 +1,13 @@
+$$ Retail cellar-lip trace (2026-06-04). Captures, per CTransition::step_up,
+$$ the CARRIED cell (sphere_path.check_pos.objcell_id) + world position
+$$ (check_pos.frame.m_fOrigin). Discriminates whether retail's carried cell
+$$ STAYS STABLE at the cellar lip (-> acdream's mid-step-up cell-flip is the bug)
+$$ or ALTERNATES like acdream (-> the connector-cell slide is the bug).
+$$ Auto-detaches (qd) after 150 step_ups so retail keeps running.
+.logopen C:\Users\erikn\source\repos\acdream\.claude\worktrees\thirsty-goldberg-51bb9b\retail-lip-trace.log
+.sympath C:\Users\erikn\source\repos\acdream\refs
+.symopt+ 0x40
+.reload /f acclient.exe
+r @$t0 = 0
+bp acclient!CTransition::step_up "r @$t0 = @$t0 + 1; .printf \"--- stepup #%d ---\\n\", @$t0; dt acclient!CTransition @ecx sphere_path.check_pos.objcell_id sphere_path.check_pos.frame.m_fOrigin.x sphere_path.check_pos.frame.m_fOrigin.y sphere_path.check_pos.frame.m_fOrigin.z; .if (@$t0 >= 150) { .printf \"=== DETACH after %d step_ups ===\\n\", @$t0; qd } .else { gc }"
+g