- Implemented a new script `local-patch-report.sh` to generate a local patch report.
- The report computes patch coverage based on changes from the current branch against `origin/main`.
- Integrated backend and frontend coverage inputs, producing both Markdown and JSON output artifacts.
- Updated existing frontend coverage script to validate the presence of LCOV coverage file.
- Added tests for coverage computation and parsing of unified diffs for changed lines.
- Enhanced error handling and validation for coverage inputs and baseline references.
