Phase 4 Gitea migration — Renovate CLI needs the endpoint URL to
connect to the self-hosted git.farh.net instance.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Adds .github/workflows/renovate.yaml — scheduled Renovate run every Saturday at 02:00 UTC using create-github-app-token with RELEASE_APP_ID/RELEASE_APP_PRIVATE_KEY. Runs renovatebot/github-action@v41.0.0 with autodiscover and renovate-config.json. Includes workflow_dispatch for manual triggering.
Pipeline B infrastructure change reviewed by CTO and QA (Regression Regina).