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test(p0): dat-backed conformance loader + characterized cottage-doorway topology

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P0 (verbatim-spatial-pipeline-port) Tasks 1+2. ConformanceDats loads the
cottage-doorway cells from the real dats with their real ContainmentBsp;
CottageDoorwayCharacterizationTests maps the Holtburg 0140..017F indoor
neighborhood and pins the master-plan threshold building (origin
161.93,7.50,94.00): 0xA9B40170 vestibule (exit portal 0xFFFF + portal to
0171), 0xA9B40171 room. Grid math confirms the outdoor side is landcell
0xA9B40031 -> the 0031<->0170<->0171 ping-pong is verified real. Verified
interior points recorded for the point_in_cell/find_cell_list goldens.

Plan: docs/superpowers/plans/2026-06-03-p0-conformance-apparatus.md
Notes: docs/research/2026-06-03-p0-conformance-apparatus-notes.md

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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# P0 — Conformance apparatus notes (characterized topology + goldens)
2026-06-03. Companion to [`docs/superpowers/plans/2026-06-03-p0-conformance-apparatus.md`](../superpowers/plans/2026-06-03-p0-conformance-apparatus.md).
Source of truth for the cell ids + golden inputs the P0 conformance tests pin. All values below
were **characterized from the real client dats** (not guessed) by
`CottageDoorwayCharacterizationTests` against `%USERPROFILE%\Documents\Asheron's Call`.
## Characterized Holtburg (landblock 0xA9B4) indoor neighborhood
Scanned `0xA9B40140..0xA9B4017F`. All cells load with a real ContainmentBsp and `seenOutside=1`.
Cells share a per-BUILDING world origin (the building's reference frame). The distinct buildings:
| Cell range | World origin | Stab | Identity |
|---|---|---|---|
| `0140..0150` (17 cells) | (130.50, 11.50, 94.00) | 17 | **Cottage-with-cellar** (#98 cellar saga; exit portals at 0145,014C,014E,014F,0150) |
| `0151..0169` (25 cells) | (107.50, 36.00, 94.00) | 24 | Larger building (inn) |
| `016A..016E` (5 cells) | (79.50, 37.50, 94.00) | 4 | Small building |
| **`016F..0175` (7 cells)** | **(161.93, 7.50, 94.00)** | 6 | **THE doorway-threshold building (master-plan 0170/0171)** |
| `0176..0178` | (65.21, 156.63, 66.00) | 2 | — |
| `0179..017A` | (158.18, 37.71, 94.00) | 1 | — |
| `017B..017F` | (161.72, 105.05, 66.00) | 4 | — |
## The pinned threshold topology (master-plan `0031↔0170↔0171`)
Building at world origin **(161.93, 7.50, 94.00)**:
| Cell | Role | Portal dests | seenOutside | BSP |
|---|---|---|---|---|
| `0xA9B40170` | **vestibule / doorway** | `[0xFFFF (exit→outdoor), 0x0171]` | 1 | real |
| `0xA9B40171` | **room** (behind the door) | `[0x0170, 0x0173, 0x0175]` | 1 | real |
Grid math confirms the outdoor side: origin (161.93, 7.50) → gridX = ⌊161.93/24⌋ = 6,
gridY = ⌊7.5/24⌋ = 0 → landcell id `6*8 + 0 + 1 = 49 = 0x31` → **outdoor landcell `0xA9B40031`**.
So the player crossing the doorway traverses `0031 (outdoor) → 0170 (vestibule, via the 0xFFFF exit
portal) → 0171 (room)` — exactly the master-plan ping-pong `0031↔0170↔0171`. **Verified real.**
> Naming note: a 2026-05-21 capture dir called `0170/0171` the "inn 2nd floor"; that label was
> loose. By geometry it is the 7-cell building at (161.93, 7.50). Identity (cottage vs inn) is
> irrelevant to the conformance — what matters is `0170` carries the exit portal (the doorway) and
> `0171` is the room behind it.
## Golden interior points (verified `point_in_cell == true`)
Cell-LOCAL points whose `EnvCell.PointInCell(world)` returns true (the world form is
`Vector3.Transform(local, cellPhysics.WorldTransform)`):
| Cell | Interior LOCAL point | Interior WORLD point | Notes |
|---|---|---|---|
| `0xA9B40170` | (5.865, -8.449, 0.417) | (156.06, 15.95, 94.42) | 115/125 grid-inset points inside (small/irregular vestibule) |
| `0xA9B40171` | (6.55, -3.25, 4.60) | (157.01, 13.69, 95.53)* | bounds-center = bsphere origin; 125/125 inside (clean box) |
\* world recomputed by the test at runtime via the cell's WorldTransform; the value above is the
firstInside probe — the canonical bsphere-origin local (6.55,-3.25,4.60) is also fully interior.
These are **retail-faithful by construction**: the ContainmentBsp is loaded from the same dats
retail loads, so a geometrically-correct containment answer is the retail answer.
## Golden provenance summary
| Golden | Provenance | Status |
|---|---|---|
| `point_in_cell` (interior true, far-away false) | geometric (real dat BSP) | autonomous (Task 3) |
| `find_cell_list` deep-inside picks `0171`/`0170` | geometric (real dat cells) | autonomous (Task 4) |
| `find_cell_list` doorway-threshold pick | **retail cdb trace** | Task 6 — USER GATE / mine existing traces |
| PVS visible-set | retail cdb `cell_draw_list` trace | deferred to P4 (Task 7 scaffold) |
## P1-entry checklist (filled at end of P0)
- [ ] Threshold golden GREEN (acdream already matches retail) or RED (P1 must fix) — recorded here.
- [ ] "P0 gate met: ≥1 retail-trace-backed assertion exists" — stated explicitly so P1 can begin.