7e6b266c34
Gitea Actions mirrors GitHub Actions env vars and does not expose a flat GITEA_EVENT_PULL_REQUEST_NUMBER. Parse the PR number out of $GITHUB_EVENT_PATH, key platform detection on $GITEA_ACTIONS, and use the correct Accept header for GitHub's diff endpoint. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>