Respect board outlines when seeding candidates

[0hmX]

Motivation

• Ensure seed candidate generation honors the board outline polygon so we don't place seeds outside the board cutout.
• Fixes incorrect seeding behavior from an older PR by applying the same outline-based filtering to both grid and edge seed paths.
• Keep visual/formatting behavior unchanged and only adjust seeding logic to be outline-aware.

Description

• Thread outline through to computeCandidates3D and computeEdgeCandidates3D and import isPointInPolygon for polygon checks.
• Early-filter candidate and edge seed points using isPointInPolygon so points outside the outline are skipped.
• Pass this.srj.outline from RectDiffSeedingSolver into both candidate helpers for consistent behavior.
• Files changed: lib/solvers/RectDiffSeedingSolver/computeCandidates3D.ts, lib/solvers/RectDiffSeedingSolver/computeEdgeCandidates3D.ts, and lib/solvers/RectDiffSeedingSolver/RectDiffSeedingSolver.ts.

Testing

• Ran typecheck with bunx tsc --noEmit and it completed successfully.
• Ran the test suite with bun test and all automated tests passed (11 pass, 1 skip, 0 fail).
• The updated board-outline snapshot test remains passing (tests/board-outline.test.ts).

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Codex Task

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Project	Deployment	Review	Updated (UTC)
rectdiff	Ready	Preview, Comment	Dec 24, 2025 8:16pm