* Add E2E test workflow with video recording and issue posting
New workflow_dispatch workflow (test-e2e.yml) that runs XCUITests on
GitHub-hosted macos-15 runners, records the virtual display, uploads the
video as an artifact, and posts results as an issue on cmux-dev-artifacts.
Includes scripts/run-e2e.sh for convenient triggering from the terminal.
* Print issue URL in workflow annotation and run-e2e.sh output
- Capture gh issue create output URL, print as ::notice annotation
- Search issues by run ID instead of grabbing most recent
