cleanup

Refactoring sprint: remove dead code, eliminate duplicates, simplify complex code.

SKILL.md.agents/skills/cleanup/SKILL.md

See agents/refactor-cleaner.md and agents/code-simplifier.md.

Detect — npx knip, npx depcheck, npx ts-prune. Categorize: SAFE/CAREFUL/RISKY.
Remove — Order: deps → exports → files → duplicates. Build-verify after each batch.
Simplify — Extract nested logic, early returns, remove console.log/commented code, consolidate duplicates.
Verify — Full build + test suite pass.

Rules: Behavior-preserving only. Be conservative. Don't run during active development.

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