caching-strategy

Repeated work wastes time and resources:

• Reading docs/project/api-strategy.md 5 times in /plan phase (5× file I/O)
• Searching codebase for "user" pattern 3 times (3× grep execution)
• Fetching npm package info for same package repeatedly (3× network calls)
• Counting tokens in spec.md every phase (5× token calculation)
• Web searching "React hooks best practices" multiple times (3× API calls)

This skill implements smart caching with:

1. File read cache: Cache file contents until file modified (mtime check)
2. Search result cache: Cache grep/glob results for 30 minutes
3. Network request cache: Cache npm/web API calls for 15-60 minutes
4. Computed value cache: Cache expensive calculations until inputs change
5. Automatic invalidation: TTL expiration + file modification detection

The result: 20-40% faster workflow execution with zero behavior changes (transparent caching).