Re-enable CI workflow

Add workflow_dispatch trigger to allow manual workflow runs
and re-enable the CI workflow that was disabled due to inactivity.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: orionarcher

.github/workflows/CI.yaml

@@ -10,6 +10,7 @@ on:
   pull_request:
     branches:
       - "main"
+  workflow_dispatch:
   schedule:
     # Midnight Tuesdays and Fridays
     - cron: "0 0 * * 2,5"