WS-3 session 1a Task 1.
Lefthook installed as root dev-dependency with postinstall = lefthook
install. The two hand-rolled scripts in .githooks/ (post-commit,
pre-push) are dispatched 1:1 from lefthook.yml: each lefthook command
shells out to the existing .githooks/<hook> script. The script bodies
are kept as the source of truth because the bash logic (merge-commit
detection, .claude-sync.conf parsing, non-blocking pre-push warning)
would be lossy to translate into a YAML run: | block.
Active hook path moved from .githooks/ to .git/hooks/ via lefthook
install (core.hooksPath unset, git falls back to its default). The
.githooks/ directory is preserved and now documented as the
implementation invoked by lefthook plus an emergency rollback target
(README added).
Smoke-tested locally: the post-commit hook fires on every commit
(verified by reverted test commit). The pre-push hook fires on every
real push with new commits — manual `lefthook run pre-push` requires
`--force` because lefthook v2 skips when {push_files} is empty (see
lefthook.yml comment).
