- Add src/platform/detector.ts with 3-tier detection (explicit input,
FORGEJO env var, GITHUB_SERVER_URL heuristic)
- Add 'platform' input to action.yml (auto/github/forgejo)
- Add 'Detect Platform' shell step as first composite action step
- Split bun installation: oven-sh/setup-bun for GitHub, curl fallback
for Forgejo runners
- Condition 'Revoke app token' step to skip on Forgejo
- Pass resolved PLATFORM env var to run step
- Add 14 unit tests covering all detection paths
Progress: M1 complete (1/9 milestones) - M2 and M5 now unblocked
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
