gha-cache-proof 1.0.0

GitHub Actions cache compatibility checker and local cache-store receipt tool for offline CI
Documentation
# Release Playbook

1. Run local gates:

   ```powershell
   cargo fmt --check
   cargo test --locked
   cargo clippy --locked --all-targets --all-features -- -D warnings
   cargo doc --locked --no-deps
   cargo package --locked
   cargo publish --dry-run --locked
   ```

2. Check the action manifest:

   ```powershell
   cargo run --manifest-path ..\action-proof\Cargo.toml -- --repo-root . --manifest action.yml --strict
   ```

3. Smoke the example workflow:

   ```powershell
   cargo run --locked -- check-workflow --repo examples --workspace examples --workflow examples/workflows/cache.yml --format json --output target/cache-proof.json
   ```

4. Commit, tag, and push:

   ```powershell
   git tag -a v1.0.0 -m "gha-cache-proof 1.0.0"
   git tag -f v1 v1.0.0
   git push origin main
   git push origin v1.0.0 v1
   ```

5. Publish:

   ```powershell
   cargo publish --locked
   ```

6. Create the GitHub Release and run `release-proof` against the public surfaces.