Sync Docs

Detect outdated documentation by comparing docs against actual code state — broken references, version mismatches, stale code examples, and missing CHANGELOG entries. Documentation drifts from code silently: a function gets renamed, an import path changes, a version bumps, but the README and CHANGELOG still reference the old state. /sync-docs compares documentation files against the current codebase, finds the gaps, and auto-applies safe fixes (version updates, CHANGELOG entries) while flaggin