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feat(physics): add differential flat BSP traversal

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Port every current containment, overlap, walkable, and six-path moving-collision query to immutable integer-indexed assets behind a graph-authoritative referee. Exact synthetic, installed-DAT, complete-resolver, and zero-allocation gates prove bit-identical behavior before connected dual publication.

Co-authored-by: OpenAI Codex <codex@openai.com>
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Erik 2026-07-25 15:47:58 +02:00
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docs/plans/2026-07-25-modern-runtime-slice-i.md
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# Modern runtime Slice I — flat collision assets and zero-allocation physics
**Status:** I0–I3 COMPLETE — retail oracle, zero-allocation transition
scratch, deterministic immutable collision records, and complete prepared
package fixed; I4 active
**Status:** I0-I4 COMPLETE - retail oracle, zero-allocation transition
scratch, deterministic immutable collision records, complete prepared
package, and exact flat-traversal differential gate fixed; I5 active
**Parent:** `2026-07-24-modern-runtime-architecture.md`, Slice I
**Purpose:** remove parsed DAT object graphs and steady collision allocations
without changing one retail collision decision, float, comparison, or traversal
@ -213,6 +213,16 @@ tests / 5 skips pass. Production traversal remains graph-only. Evidence:
Gate: zero differential mismatch. Any mismatch blocks cutover; no tolerance
band is permitted for deterministic scalar results.
**PASSED 2026-07-25:** the integer-indexed shadow ports every current
containment, overlap, walkable, and six-path moving-collision entry point.
The 13-test referee completed 10,000 randomized static/swept comparisons,
5,000 walkable comparisons, 7,500 installed-DAT comparisons across three
representative cells, all six dispatcher paths, and 1,200 complete resolver
frames with exact state and float-bit equality. Ten thousand warmed flat
iterations allocated zero managed bytes. Production remains graph-authoritative
until I5/I6. Release build and 8,384 solution tests / 5 skips pass. Evidence:
[`../research/2026-07-25-slice-i4-flat-bsp-differential.md`](../research/2026-07-25-slice-i4-flat-bsp-differential.md).
### I5 — dual publication and connected shadow gate
1. Extend collision preparation so a `LandblockBuild` carries immutable flat