* feat: block force pushes via pre-push hook

Adds a `check-no-force-push` pre-push hook that detects and blocks
`git push --force` / `git push -f` by inspecting pushed ref ancestry
via `git merge-base --is-ancestor`.

## Detection logic

Reads git's pre-push stdin (<local ref> <local sha> <remote ref> <remote sha>)
and evaluates:

- Remote SHA is zero -> new branch push -> pass
- merge-base returns 0 -> fast-forward -> pass
- Returns 1 -> force push detected -> fail
- Returns 128 -> git error, pass (safe default)

## Standalone mode

When run without stdin, --no-force-push checks whether pushing HEAD to its
configured upstream would require force, using git ls-remote and optional
git fetch to resolve the remote commit.

Closes #203

* docs: add push safety section to README and examples

* test: add coverage for validate_push API and push rule fallback

* Add force option to documentation for next version

* fix: fetch remote ref before force-push check

* chore: revert labeler.yml changes

* fix: use pre-commit push metadata

* fix: ensure pre-push hook always runs and remove -p short flag

- Add always_run: true to check-no-force-push hook in .pre-commit-hooks.yaml
  to prevent pre-commit from skipping the hook when zero files changed
  (e.g. force push with identical tree, different history)
- Remove -p short flag from --no-force-push CLI argument; the flag is
  exclusively used in pre-commit hooks, not interactive CLI use

* docs: improve Why Commit Check comparison table

- Fix commitlint signed-off-by: change from ✅ to Partial (requires community plugin)
- Add YACC (Yet Another Commit Checker) column for complete competitive landscape
- Add 3 new comparison rows: Open source & free, Client-side enforcement, AI-native
- Fix YACC author validation, co-author ignore, org-level config based on official docs
- Add footnotes for commitlint signed-off-by, YACC context, and YACC ignore semantics

* chore: Apply suggestion from @shenxianpeng

Add frequently-used verbs that were missing from the imperatives set,
including 'block' and 'improve' as requested. Total verbs: 234 → 390.

New verbs organized by category:
- Auth/security: grant, revoke, restrict, encrypt, decrypt, sanitize
- Data ops: batch, broadcast, compress, duplicate, marshal, shuffle, sort
- Lifecycle: abort, suspend, resume, terminate, pause, discard, dispose
- I/O & networking: attach, detach, bind, mount, disconnect, route, flush
- Debug/observability: debug, trace, track, measure, infer, notify, warn
- UI/UX: hide, toggle, switch, mask, outline
- Engineering: migrate, integrate, isolate, inject, schedule, throttle,
  document, rebase, squash, reformat, redirect, relocate
- General: compose, embed, expose, exclude, ignore, skip, lock, minimize,
  maximize, navigate, reconcile, retry, reuse, rewrite, setup, spawn