v0.0.4

test: increase code coverage to >90% with comprehensive unit tests (#17)

* test: increase code coverage to >90% with comprehensive unit tests

- Added extensive unit tests for CLI, Errors, and GitHub modules.
- Implemented YAML edge case coverage (empty/malformed files).
- Verified idempotency and ignore-actions logic.
- Refactored main.rs and operations.rs for better testability.
- Achievement: ~91% line coverage.

* feat: add verify, GHE support, .pinner.toml, and shell completions; improve docs

* chore: fix clippy warnings and add doc-tests

- Resolved clippy failures by removing unnecessary borrows in test cases.
- Updated io::Error creation to use idiomatic `other` method.
- Added 6 doc-tests to improve API documentation and code coverage.