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New guide: reference/code-quality-universal.md (~320 lines) - Code reuse audit: search existing utilities before accepting new code - Parameter sprawl: options object / dataclass instead of 4+ params - Leaky abstractions: hide ORM/HTTP/file format internals - Stringly-typed code: use enum/constant/union type over raw strings - Nested conditionals: flatten ternary chains and nested if/else - Copy-paste variants: unify near-duplicate code with shared abstraction - No-op updates: add change-detection guards to polling/intervals - TOCTOU: replace check-then-act with try-act-catch - Overly broad operations: push filtering to DB/storage layer - Redundant state: derive values instead of storing duplicates Updated SKILL.md Phase 3 with Reuse Check dimension + cross-cutting guide table. Extended performance-review-guide.md with low-level efficiency patterns: unnecessary work, missed concurrency, hot-path bloat, unbounded data structures. Updated README.md bilingual tables, trees, and badges.