docs(perf): close Slice B with full-bake evidence

docs/research/2026-07-24-slice-b-full-bake-report.json

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+{
+  "schemaVersion": 1,
+  "capturedUtcDate": "2026-07-24",
+  "binaryCommit": "90bf6bbf455654dd1cfe1749b19bfd36b769939c",
+  "pakFormatVersion": 1,
+  "bakeToolVersion": 2,
+  "datIterations": {
+    "portal": 2072,
+    "cell": 982,
+    "highRes": 497,
+    "language": 994
+  },
+  "threads": 8,
+  "enumerated": {
+    "gfxObj": 15318,
+    "setup": 5935,
+    "envCell": 729888
+  },
+  "output": {
+    "gfxObjKeys": 15318,
+    "setupKeys": 5935,
+    "envCellKeys": 729888,
+    "uniqueEnvCellGeometries": 17117,
+    "envCellAliases": 712771,
+    "envCellDedupRatio": 42.64,
+    "sideStagedNewKeys": 0,
+    "sideStagedDuplicateKeys": 13284,
+    "physicalBlobs": 38370,
+    "totalKeys": 751141,
+    "failures": 0,
+    "bytes": 29561864760,
+    "mibibytes": 28192.4
+  },
+  "timing": {
+    "extractAndWriteSeconds": 81.2,
+    "validatedAndPublishedSeconds": 81.4
+  },
+  "memory": {
+    "peakWorkingSetMibibytes": 5073.7,
+    "peakPrivateMibibytes": 4507.3,
+    "note": "Offline bake-process peak while constructing and serializing 28.2 GiB of immutable payloads; this is not client runtime residency."
+  },
+  "validation": {
+    "headerAndDatIterations": "pass",
+    "tocCountOrderAndEveryRange": "pass",
+    "atomicOverwrite": "pass",
+    "temporaryFilesRemaining": 0,
+    "crossLandblockAliasSample": {
+      "sharedOffset": 16170873792,
+      "aliasCountAtReceipt": 25,
+      "sampleFileIds": [
+        "0x00A90230",
+        "0x00B901A8",
+        "0x00E50602",
+        "0x00E50610",
+        "0x00E5061F",
+        "0x00F90784",
+        "0x00F9078E",
+        "0x00FA073E"
+      ]
+    },
+    "filteredThreadCountDeterminism": {
+      "threads": [1, 8],
+      "envCellKeys": 8,
+      "physicalBlobs": 1,
+      "sha256": "C8187761ED30CE9412C9081F52067159AECA5B02EB316E73DA29DC88D4339642"
+    },
+    "releaseBuild": "pass-with-17-pre-existing-test-warnings",
+    "completeReleaseSuite": {
+      "passed": 8059,
+      "skipped": 5,
+      "failed": 0
+    }
+  },
+  "artifactPolicy": "The generated pak is an untracked machine artifact and is deleted after final verification. This compact path-free report is the committed evidence."
+}

docs/research/2026-07-24-slice-b-full-bake-report.md

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+# Slice B full-bake report
+
+**Date:** 2026-07-24  
+**Measured binary:** `90bf6bbf455654dd1cfe1749b19bfd36b769939c`  
+**Result:** pass, zero extraction failures
+
+Slice B replaces the failed 865 GB per-cell bake with a deterministic,
+content-identity package. The client does not consume this package yet; this is
+the offline prepared-content foundation for Slice C.
+
+## Full installed-DAT result
+
+| Measure | Result |
+|---|---:|
+| GfxObj keys | 15,318 |
+| Setup keys | 5,935 |
+| EnvCell keys | 729,888 |
+| Unique EnvCell geometries | 17,117 |
+| EnvCell aliases | 712,771 |
+| EnvCell deduplication | 42.6× |
+| Physical blobs | 38,370 |
+| Total TOC keys | 751,141 |
+| Failures | 0 |
+| Extract + write | 81.2 seconds |
+| Validate + atomic publish total | 81.4 seconds |
+| Artifact size | 29,561,864,760 bytes (28,192.4 MiB) |
+| Peak working set | 5,073.7 MiB |
+| Peak private bytes | 4,507.3 MiB |
+
+The memory figures belong to the short-lived offline bake process while it
+constructs and serializes 28.2 GiB of immutable payloads. They are not expected
+client residency: the later runtime source memory-maps the package and
+deserializes only demanded assets. Sixteen-result extraction batches and
+immediate rejection of already-written side-staged meshes keep live bake graphs
+bounded; 13,284 redundant particle-preload results were discarded without
+retention.
+
+The header carries format version 1, bake-tool version 2, and source DAT
+iterations portal 2072, cell 982, high-res 497, language 994. Validation opened
+the completed temporary package, checked those values, strict TOC ordering,
+all 751,141 physical ranges, and then published with a same-volume atomic
+overwrite move. No temporary artifact remained.
+
+## Identity correction discovered by the gate
+
+The first guarded full catalog stopped on a real collision in WorldBuilder’s
+31× polynomial:
+
+- Cell `0x00030175`: environment `0x277`, structure 0, surfaces
+  `0x013B, 0x0034`.
+- Cell `0x01BC0105`: environment `0x276`, structure 0, surfaces
+  `0x04FC, 0x0034`.
+- Both legacy identities: `0x00000002020E8C13`.
+
+Those cells have different vertices and polygons. Silently aliasing them would
+render the wrong room. Runtime and bake now share a namespaced FNV-1a identity
+over the complete typed tuple, while the catalog still compares full tuples and
+fails loudly on any future collision. The legacy calculation remains as a
+conformance test proving this exact installed-DAT case.
+
+## Alias and determinism gates
+
+A sampled physical receipt at offset `16170873792` is shared by 25 EnvCell keys
+across multiple landblocks. Eight of those keys were baked independently with
+one and eight workers. Each output contained eight keys backed by one physical
+blob, and both files were byte-identical:
+
+`C8187761ED30CE9412C9081F52067159AECA5B02EB316E73DA29DC88D4339642`
+
+The generated full pak remains an untracked machine artifact and is deleted
+after final verification. The machine-readable, path-free evidence is
+[`2026-07-24-slice-b-full-bake-report.json`](2026-07-24-slice-b-full-bake-report.json).
+
+Release build passed with 17 pre-existing test-source warnings. The complete
+Release suite passed 8,059 tests with five skips and zero failures. The generated
+full and filtered pak artifacts were then deleted as required.