add authored PRs fetch, JSON API routes, and briefing visual improvements
- gh-notifications flow now also fetches open issues/PRs authored by
zzstoatzz via the search API, merged and deduped with notifications
- extract shared loaders; add /api/cards.json, /api/briefing.json,
/api/stats.json endpoints for machine consumption
- briefing cards: repo names as colored pills linking to repo,
separate #number links, stronger background tints (/20 → /40)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>