chore(pre-commit): add ruff hook for interviews/vault-cli/

Mirrors the ruff check that the StaffML Validate (Vault) workflow already
runs in CI, so the same 20-violation class of failure caught on dev
yesterday is stopped at commit time on a developer's machine.

Scoped strictly to interviews/vault-cli/*.py and uses the ruff config in
vault-cli's own pyproject.toml. Pinned to ruff-pre-commit v0.15.12.

Author: profvjreddi

.pre-commit-config.yaml

@@ -708,6 +708,18 @@ repos:
         files: ^interviews/vault/schema/(enums\.py|question_schema\.yaml)$
         pass_filenames: false
 
+  # Mirror the `ruff check` step in `🎯 StaffML · ✅ Validate (Vault)`
+  # (.github/workflows/staffml-validate-vault.yml) so violations are caught
+  # locally before they land on dev. Configuration lives in
+  # interviews/vault-cli/pyproject.toml ([tool.ruff]); pre-commit picks it
+  # up automatically because it runs from that directory.
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.15.12
+    hooks:
+      - id: ruff
+        name: "Vault: Lint vault-cli (ruff)"
+        files: ^interviews/vault-cli/.*\.py$
+
   # ===========================================================================
   # DISABLED/OPTIONAL HOOKS
   # ===========================================================================