chore(ci): add PR title lint to enforce conventional commits

[FSM1]

Summary

• Adds a GitHub Actions workflow that validates PR titles against Conventional Commits format
• Prevents malformed squash-merge commit messages from breaking Release Please changelog parsing (as happened with Fix vault sync loading state and stale closure bug #65)

Test plan

• Open a PR with a non-conventional title (e.g., "Fix something") — check should fail
• Edit the title to conventional format (e.g., "fix: something") — check should pass

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/pr-title-lint

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Pull request overview

Adds CI enforcement to ensure PR titles follow Conventional Commits, helping keep squash-merge commit messages compatible with Release Please changelog parsing.

Changes:

• Introduces a GitHub Actions workflow that lints PR titles on open/edit/synchronize.
• Implements a bash regex gate for allowed Conventional Commit type(scope): description headers.