docs(physics): close Slice I evidence and roadmap

Record the accepted flat-authoritative collision cutover, production parsed-graph removal, exact rollbacks, zero-residency connected gates, and RDP measurement boundary. Reconcile architecture, milestones, roadmap, issue ledger, agent instructions, and the active Slice J handoff.

Validated by the existing zero-warning Release build, 8,413 passing Release tests with five pre-existing skips, 201 focused closeout tests, and both exact-binary connected routes.

Co-authored-by: Codex <codex@openai.com>

docs/research/2026-07-25-slice-i7-closeout.md

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+# Slice I7 — flat collision closeout
+
+## Result
+
+Modern Runtime Slice I is complete. Production collision consumes the
+immutable prepared flat representation exclusively, per-resolve scratch is
+retained and reset-complete, and no parsed DAT collision graph remains in
+stable gameplay state.
+
+The two production cutover commits are:
+
+- flat-authoritative traversal:
+  `068a06518dd710ca5e7f166754cbb7789ca1ed0f`;
+- parsed-graph removal:
+  `82f8d4f82e24ad85042ac3e25c4f6464bebce758`.
+
+Exact rollback commands:
+
+```text
+git revert 82f8d4f82e24ad85042ac3e25c4f6464bebce758
+git revert 068a06518dd710ca5e7f166754cbb7789ca1ed0f
+```
+
+Revert graph removal first. Do not revert the I3 prepared-package, I4
+flat-traversal, or I5 publication work unless evidence implicates those
+layers.
+
+## Production ownership after removal
+
+- `PhysicsDataCache` publishes immutable flat GfxObj, Setup, CellStruct, and
+  EnvCell topology records directly.
+- Stable `GpuWorldState` strips temporary `PhysicsDatBundle` source material.
+- Near `LandblockBuild` payloads discard Environment/GfxObj raw collision
+  graphs after their immutable flat closure is built.
+- Live objects publish through the same strict prepared source.
+- Graph constructors remain only as explicit test, bake, and equivalence
+  oracles. Production has no graph fallback and no sampled referee.
+- The single validated `acdream.pak` mmap remains the production render and
+  collision source.
+
+This is a storage/ownership change only. Collision comparisons, traversal
+order, source float bits, retail thresholds, cell semantics, and authoritative
+game behavior did not change.
+
+The retail divergence register was audited. No row was added or retired:
+Slice I changes the representation and lifetime of already ported collision
+data without introducing a behavior deviation.
+
+## Automated evidence
+
+- Release build: pass with zero errors and zero warnings.
+- Complete Release solution: 8,413 passed / 5 skipped.
+- Focused Core collision, doors, doorway, cellar/ramp, jump, projectile, and
+  allocation gate: 154 passed.
+- Focused App camera/projectile gate: 47 passed.
+- Player, grounded walkable publication, remote, projectile, and camera
+  profiles: 0 B/resolve.
+- Direct flat `CellSurface`, walkable-plane, behaviorless-cell, stable-state
+  stripping, and production graph-residency fixtures pass.
+
+## Connected lifecycle/reconnect gate
+
+Report:
+`logs/connected-world-gate-20260725-182242/report.json` in the exact-binary
+gate worktree.
+
+- Source and binary:
+  `82f8d4f82e24ad85042ac3e25c4f6464bebce758`.
+- Result: PASS; two graceful exits; zero failures.
+- Six capped checkpoints plus one fresh-process uncapped reconnect passed.
+- Parsed collision graph counts were `0/0/0` at every checkpoint.
+- Flat GfxObj/Setup/cell residency remained populated, including:
+  - capped login: `168/112/71`;
+  - Rynthid: `384/262/790`;
+  - Facility Hub: `436/272/279`;
+  - Holtburg after dungeon: `761/415/531`;
+  - fresh uncapped reconnect: `167/103/59`.
+- Publication, retirement, upload, warmup, and class backlogs converged.
+
+The 25 world-edge misses are the route's existing expected diagnostic, not a
+new collision failure.
+
+## Connected canonical nine-stop gate
+
+Report:
+`logs/connected-r6-soak-20260725-182823.report.json` in the exact-binary gate
+worktree.
+
+- Result: PASS; graceful exit; zero failures.
+- All nine portal checkpoints materialized and stabilized.
+- Parsed collision graph counts were `0/0/0` at all nine checkpoints.
+- Flat cell residency covered Caul, Sawato, Rynthid, Aerlinthe, and Holtburg,
+  including 790 cells at Rynthid and 531 at Holtburg.
+- Movement, jump/fall, combat/projectile, portal, dungeon, revisit, and
+  authoritative server-echo checks passed.
+- Final publication, retirement, worker, destination, control, unload,
+  near/far, staged-upload, and composite-warmup backlogs were zero.
+
+The known route warnings were limited to a Caul visible-workload delta of two,
+an eleven-particle plateau delta, 32 optional missing-DAT VFX diagnostics, and
+the 25 expected world-edge misses.
+
+## Measurement boundary
+
+The user accepted collision correctness under RDP. The RDP nine-stop route
+also showed a bounded final plateau near 1.93 GiB working set while carrying
+observer/automation state, below the earlier dual-representation diagnostic
+route's roughly 2.06 GiB final Caul working set. Those are not controlled
+ordinary-client measurements, so no exact performance percentage is claimed.
+
+Absolute post-removal CPU, GPU, frame-time, and ordinary-process memory
+comparison remains deferred to the next physical-display performance pass.
+That deferral does not weaken the deterministic, connected, ownership, or
+resource-lifetime acceptance above.
+
+## Next execution point
+
+Slice J1 begins the borrowed-view, typed-command, ordered-event, clock, and
+lifecycle contract layer in `AcDream.Runtime`. It must adapt the current
+canonical owners first; it may not create a second gameplay world or add a
+frame of graphical input latency.