Improve strong-connection placement after partition packing

[5p00kyy]

Summary

• add a constrained post-pack refinement for small components joined by two strong pin-to-pin connections
• evaluate allowed rotations and axis-aligned placements, accepting only candidates that shorten each local connection
• preserve fixed placements and chip clearance, and roll back if refinement introduces a new body obstruction or connection crossing
• add regression coverage for the existing SI7021 reproduction plus determinism, rotation, fixed-position, obstacle, overlap, and crossing cases

Result

On the existing SI7021 fixture, total Manhattan length across strong connections falls from 5.9 to 4.0 (32.2%) in the full pipeline, with zero component overlaps. The input fixture is unchanged.

The new behavior is deliberately narrow: it only runs inside generic partition packing and only considers components with two strong connections. Existing specialised semantic layout paths remain unchanged.

Verification

• bun test tests/refineStrongConnections.test.ts — 10 passed
• bunx tsc --noEmit
• bun run build
• bun run format:check
• git diff --check
• full bun test — 119 passed, 1 skipped, 1 timeout

The timeout is tests/repros/repro-wled-matrix-iteration-budget.test.ts; I reproduced the same 30-second timeout on an untouched origin/main worktree.

/claim #12

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Project	Deployment	Actions	Updated
matchpack	Ready	Preview	Sep 8, 2026 10:41pm UTC