ci: add semantic PR title linting workflow

[snowrugar-beep]

Problem Statement

No semantic versioning enforcement on PR titles. This means the changelog generator cannot automatically categorize changes by type (feat, fix, chore, etc.).

Evidence

• No PR title check workflow
• Changelog generator expects conventional commit format

Impact

Changelog generator cannot categorize changes. Release notes must be manually compiled.

Proposed Solution

Create GitHub Action workflow that validates PR titles match conventional commits format (feat:, fix:, chore:, docs:, refactor:, test:, ci:, security:, perf:, infra:, obs:, a11y:).

Technical Requirements

• Must use amannn/action-semantic-pull-request action
• Must validate on PR open and title edit
• Must provide clear error message on invalid titles
• Must list valid types in error message

Acceptance Criteria

1. PR with valid title passes check
2. PR with invalid title fails check with helpful error
3. Check runs on PR creation and title edits
4. Valid types match project conventions

File Inventory

• .github/workflows/pr-title-lint.yml (new)

Dependencies

None.

Testing Strategy

• Create test PR with valid and invalid titles

Security Considerations

None.

Definition of Done

• PR lint workflow created
• Working correctly

[Moonwalker-rgb]

Hi Maintainer,

I’d love to work on this issue. I’ve reviewed the requirements and believe I can implement the solution according to the project’s guidelines and best practices.

If the issue is available, I’d be happy to take ownership and submit a PR for review.

Thank you for your consideration.

[grantfox-oss]

🦊 GrantFox — @Moonwalker-rgb has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #36)
2. Your PR will be reviewed by the VertexChainLabs maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@Moonwalker-rgb's PR #79 was approved and merged by @snowrugar-beep.

🏆 @Moonwalker-rgb: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (153 total points). Track your full progress on GrantFox.

👏 Great work, @Moonwalker-rgb! Keep contributing to VertexChainLabs.