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

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Erik 2026-07-24 14:10:50 +02:00
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docs/plans/2026-07-24-modern-runtime-slice-b-envcell-dedup.md
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# Modern Runtime Slice B — EnvCell geometry deduplication and full bake
**Date:** 2026-07-24
**Status:** Planned; implementation follows the Slice A diagnostic capture
**Status:** Complete 2026-07-24; full installed-DAT gate passed
**Parent:** [`2026-07-24-modern-runtime-architecture.md`](2026-07-24-modern-runtime-architecture.md), Slice B
**Prior implementation:** [`../superpowers/plans/2026-07-05-mp1b-pak-and-bake.md`](../superpowers/plans/2026-07-05-mp1b-pak-and-bake.md)
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Complete the existing MP1b bake without changing runtime behavior. Every
EnvCell file ID remains an independently addressable pak key, while cells with
the same WorldBuilder geometry identity share one serialized blob and one
the same collision-resistant geometry identity share one serialized blob and one
physical byte range. The client does not consume the pak in this slice.
The full gate must replace the failed 865 GB / 52 minute per-cell bake with a
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equivalence and determinism gates are green, duplicate EnvCells demonstrably
share physical offsets, and no runtime code consumes the pak.
## Completion record
All checkpoints B1-B5 are complete. The full installed-DAT bake produced
751,141 addressable keys backed by 38,370 physical blobs with zero failures.
The 729,888 EnvCell keys resolve to 17,117 unique geometries and 712,771 aliases
(42.6×). The validated package is 28,192.4 MiB and publishes atomically in
81.4 seconds on the reference machine. A cross-landblock eight-key alias fixture
is byte-identical with one versus eight workers. Full evidence:
[`../research/2026-07-24-slice-b-full-bake-report.md`](../research/2026-07-24-slice-b-full-bake-report.md).
No runtime code reads the pak in this slice. Slice C remains blocked by the
physical-local Slice A baseline gate. Release build and the complete solution
suite pass (8,059 passed, five skipped, zero failed); generated pak artifacts
were deleted after validation.
## Verification
Run: