chore(sync): cascade stale-process-sweeper + _helpers + install-sfw refresh

Picks up wheelhouse cascade content drift:
- `.claude/hooks/stale-process-sweeper/index.mts`
- `.git-hooks/_helpers.mts` + `pre-push.mts` + `test/_helpers.test.mts`
- `scripts/install-sfw.mts` + `scripts/lockstep.mts`
- `.config/oxlintrc.json` + `.config/oxfmtrc.json` — fleet-canonical block
  refresh (no structural change)

Author: jdalton