Fix zero-length trace path cleanup

[ar-amk]

/claim #78

Summary

• strip consecutive duplicate path points before collinear cleanup so zero-length trace segments cannot survive post-processing
• rerun collinear collapse with duplicate-point cleanup until the path stops shrinking
• add focused unit coverage for duplicate points and zero-length two-point paths

Tests

• bun test tests/solvers/TraceCleanupSolver/simplifyPath.test.ts tests/solvers/TraceCleanupSolver/TraceCleanupSolver.test.ts
• bun test
• bun run format:check
• bun run build
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview, Comment	May 20, 2026 10:12pm