Update the Project Documentation

Produce documentation whose claims are true of the code as it is now, and keep it that way cheaply. Every statement traces to a file that was read; nothing is inferred from a directory name.

Let SKILL=/path/to/this/skill — the directory holding this SKILL.md. Commands run from the repository being documented, not from the skill directory. Needs Python 3.11+ and git; the churn analysis reads history, so on a shallow clone (git rev-parse --is-shallow-repository → true) the "directories churning with no coverage" finding is unreliable — fetch full history or say the check was skipped.

First: is this a refresh or a first write?

python "$SKILL/scripts/check_doc_staleness.py"                       # .claude/skills/documentation
python "$SKILL/scripts/check_doc_staleness.py" --docs docs/ --repo .
python "$SKILL/scripts/check_doc_staleness.py" --format json