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fix(mesh): winding consistency replaces the connectivity heuristic

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Gate attribution put connectivity behind 153 of 225 misses -- the largest
blocker, and the gate already known to reject a capture-proven block. Testing it
against winding consistency (an objective topology signal: ~1.0 or ~0.0 for a
real mesh, ~0.5 for a mis-carve) shows a floor of 0.70 with connectivity inert
dominates the previous default on both axes: 6212 resources decoded (+143) with
39 shared inconsistencies (-17), capture oracle unchanged at 46/46, twin
invariant clean, coverage invariant intact. Suite green.

The 0.80 cliff (5770 resources, 0 inconsistent) is documented, not taken --
consistency is the weaker witness, and both points are one env var apart.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Claude (auto-RE)
2026-08-12 05:47:01 +00:00
parent ee2b98341d
commit f835705b48
3 changed files with 116 additions and 8 deletions
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33
docs/re/structures/xbg7-mesh.md
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@@ -1009,6 +1009,39 @@ Every decoded sub-mesh on the disc now covers its own vertex pool: **8 580 at
slack 0, 49 within the ±4 tolerance, none beyond it, none negative.** Coverage,
consistency and the capture oracle are all unchanged by the tightening.
### ✅ Fixed: winding consistency replaces the connectivity heuristic
With every miss attributed (below), **connectivity accounted for 153 of 225** —
by far the largest blocker, and the one gate already known to reject a
capture-proven block. So it was tested against the alternative the decoder
already trusts elsewhere: **winding consistency**, `max(na, 1−na)`, where a real
mesh sits at ≈1.0 or ≈0.0 and a mis-carve lands near 0.5. It is an objective
topology test; the edge-ratio is a shape heuristic.
Swapping them (connectivity inert, winding gating the pad-0 path):
| winding floor | resources decoded | shared inconsistent | capture oracle |
|---|---|---|---|
| — (connectivity 0.42, previous default) | 6 069 | 56 | 46/46 |
| 0.60 | 6 214 | 53 | — |
| **0.70 (now)** | **6 212** | **39** | **46/46** |
| 0.80 | 5 770 | 1 | — |
| 0.85 | 5 770 | 0 | 46/46 |
**0.70 dominates the previous default on both axes** — 143 more resources decode
*and* 17 fewer shared resources disagree across containers — with the capture
oracle unchanged at 46/46 claimed, 0 unclaimed, the twin invariant still clean
(18 exact mirrors, 22 related, 0 collapses, 0 unrelated across 40 pairs, up from
34), and every decoded sub-mesh still covering its pool. So it ships, and the
connectivity cap drops to an inert 1.0, kept as a knob and a backstop.
The cliff at 0.80 is recorded rather than taken: it buys **perfect** cross-container
consistency (0 inconsistent) for 442 resources. Consistency is the weaker witness
— a systematic mis-anchor is consistent — so paying that much coverage for it is
not obviously right, and both points are one env var apart
(`XBG7_PAD0_CONSISTENCY`, `XBG7_EDGE_CAP`) for anyone who wants the conservative
end.
### Coverage has a denominator now, and the misses have a cause breakdown
Coverage has been quoted as "resources decoded" with no total. `examples/undecoded.rs`