fix(hooks): self-updating pre-commit hook#288
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Summary
Adds a self-update check (Part 0) to the pre-commit hook. On every commit, the
hook compares the mtime of .github/hooks/pre-commit against the installed
.git/hooks/pre-commit. If the source is newer, it copies itself, re-chmod, and
re-execs -- so developers on existing clones silently get hook updates after a
git pull, with no manual npm install required.
Why
The llms-full.txt regen (Part 2) was added to .github/hooks/pre-commit but
fleet-dev had a stale installed hook that predated it, causing llms-full.txt to
fall out of sync without any warning. This fix makes the hook self-healing.
Test plan
"pre-commit: hook updated" message appears before the commit proceeds