* chore: import AGENTS.md from CLAUDE.md so Claude Code loads project instructions
Claude Code does not yet natively support AGENTS.md. The previous CLAUDE.md
was a human-readable redirect, but the agent never followed it. Using the
@AGENTS.md import directive (which Claude Code does support) makes the
project instructions auto-load.
* chore: clarify dev-deps sync and pre-commit workflow in AGENTS.md
- Note that running tests inside a sub-package needs uv sync --group dev
--package <name>; the default sync skips sub-package dev deps and leaves
things like fakeredis uninstalled.
- Tighten the pre-commit workflow section: pre-commit hooks already run
ruff/biome on commit, so the previous 5-step manual sequence overstated
what's needed.