CI: Add PR title verifier workflow

[rubambiza]

Summary

• Adds a caller workflow that invokes the org-level reusable PR title verifier from kagenti/.github
• Enforces PR title prefix conventions (Feat, Fix, Docs, etc.) on all pull requests
• No changes to existing workflows or repo configuration

[evaline-ju]

@rubambiza could you please look into the failing end-of-file-fixer check in the CI on this PR?

[rubambiza]

Update: The reusable workflow in kagenti/.github is now live (PR #66 merged), so this caller workflow will fire correctly as soon as this PR is merged.

However, the pinned SHA in this workflow will need a final bump once kagenti/.github#67 merges. That PR adds FORCE_JAVASCRIPT_ACTIONS_TO_NODE24=true to suppress a Node.js 20 deprecation warning from the action-pr-title action (GitHub is removing Node 20 runner support on September 16, 2026). The action itself is safe for Node 24 (only uses @actions/core and @actions/github).

Once #67 merges, I'll push an updated SHA pin to this branch.

[rubambiza]

@rubambiza could you please look into the failing end-of-file-fixer check in the CI on this PR?

@evaline-ju Thanks for flagging. It's been fixed, and the fix has been replicated to all other 12 PRs! As noted above, this PR needs one more commit to bump the SHA once kagenti/.github#67 is merged. If you have 30 secs, I'd appreciate some eyes on the .github PR.