docs: enhance 5 thin commands and add Rust API example
Commands enhanced with multi-language support, error recovery strategies,
and structured step-by-step workflows:
- build-fix: build system detection table, fix loop, recovery strategies
- test-coverage: framework detection, test generation rules, before/after report
- refactor-clean: safety tiers (SAFE/CAUTION/DANGER), multi-language tools
- update-codemaps: codemap format spec, diff detection, metadata headers
- update-docs: source-of-truth mapping, staleness checks, generated markers
New example:
- rust-api-CLAUDE.md: Axum + SQLx + PostgreSQL with layered architecture,
thiserror patterns, compile-time SQL verification, integration test examples
Affaan Mustafa