Fixed 4 failing workflow checks:
1. **Build/Lint/Test workflows**: Fixed yarn install authentication
- Changed Git URL rewrite to include GITHUB_TOKEN in all rewrites
- Added GITHUB_TOKEN and GIT_TERMINAL_PROMPT env vars to yarn install step
- Now correctly handles github: dependencies (like libsignal)
2. **PR Comment workflow**: Fixed missing token error
- Changed from secrets.PERSONAL_TOKEN to secrets.GITHUB_TOKEN
- Workflow now has proper authentication
Root cause: Yarn 4.x was trying to clone github: dependencies via SSH,
but CI had no SSH keys. Git config now rewrites ALL GitHub URLs to
HTTPS with token authentication.
https://claude.ai/code/session_015R3U3kiprQiNTTNNt31Sg6