feat: add agentic workflow to update release notes based on tag diff

[Copilot]

Adds an agentic workflow that triggers on new releases and automatically enhances release notes by analyzing the diff between the current and previous tags.

Changes

• New workflow (update-release-notes.md): Triggers on release: published and workflow_dispatch
• Diff analysis: Uses git log, git diff, git tag, git show to compare tags
• Categorized output: Generates structured release notes with Features, Bug Fixes, Security, Documentation, etc.
• Safe output: Uses update-release to securely update the release body

Workflow behavior

1. Receives tag name from ${{ github.event.release.tag_name }}
2. Finds previous tag via git tag --sort=-version:refname
3. Analyzes commits and file changes between tags
4. Replaces release notes with enhanced, categorized summary
5. Handles first release case (no previous tag)

Original prompt

create a new agnetic workflow that triggred by the new release and update the release notes based on the diff of latest tag and the prior tag.

Custom agent used: create-agentic-workflow
Design agentic workflows using GitHub Agentic Workflows (gh-aw) extension with interactive guidance on triggers, tools, and security best practices.

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[github-actions]

Test Coverage Report

Metric	Coverage	Covered/Total
Lines	81.02%	1230/1518
Statements	80.98%	1261/1557
Functions	78.16%	136/174
Branches	72.56%	410/565

Coverage Thresholds

The project has the following coverage thresholds configured:

• Lines: 38%
• Statements: 38%
• Functions: 35%
• Branches: 30%

---

Coverage report generated by `npm run test:coverage`