docs: mention pre-commit in AGENTS.md and CLAUDE.md

AGENTS.md

@@ -35,6 +35,10 @@ make demo     # python -m contextweaver demo
 make ci       # fmt + lint + type + test
 ```
 
+After cloning, run `pre-commit install` once to activate the git hooks. The hooks
+run `ruff format` and `ruff check --fix`, plus standard file hygiene checks,
+automatically on every `git commit`.
+
 ## Conventions
 - Python ≥ 3.10, zero runtime dependencies
 - All public APIs: type hints + docstrings

CLAUDE.md

@@ -1,6 +1,7 @@
 # contextweaver — Claude Guide
 
 ## Do
+- Run `pre-commit install` once after cloning to activate git hooks (ruff format + check, and file hygiene checks, on every commit)
 - Run `make ci` before submitting any change
 - Use `make fmt` to auto-format code
 - Keep each module ≤ 300 lines