release/verify: install pre-commit hooks before pytest to unblock failing run

[Copilot]

The release workflow’s verify job was failing because it ran tests that assert pre-commit hook installation without first installing those hooks. This PR aligns release verify setup with the existing CI path so the hook-dependent Phase 0 check can execute in the expected environment.

• Root cause

  • tests/test_phase0_gitleaks.py::test_pre_commit_hook_is_installed expects .git/hooks/pre-commit to exist.
  • release.yml verify job installed dependencies but skipped pre-commit install.

• Workflow change

  • Added a dedicated pre-commit setup step in jobs.verify of .github/workflows/release.yml:
    • pre-commit install
    • pre-commit install-hooks

• Effect on verify semantics

  • Keeps lint/type/test gates unchanged.
  • Ensures the verify environment satisfies the repository’s Phase 0 gitleaks/hook contract.

- name: Install pre-commit hooks (gitleaks binary)
  run: |
    pre-commit install
    pre-commit install-hooks