docs: add quickstart, agent setup, orchestration guides + SEO overhaul
Documentation:
- Add docs/quickstart.md — 5-minute first agent tutorial (register,
create task, poll queue, complete, heartbeat)
- Add docs/agent-setup.md — registration methods, SOUL personalities,
config, heartbeats, agent sources
- Add docs/orchestration.md — 7 patterns: manual assignment, queue
dispatch, auto-dispatch with model routing, Aegis quality review,
cron recurring tasks, multi-agent handoff, stale task recovery
- Add "Getting Started with Agents" section to README with guide table
- Add cross-reference links to docs/deployment.md
SEO:
- Fix app layout title/description for search ranking
- Add og:type, og:siteName, upgrade twitter card to summary_large_image
- Add public/robots.txt (block /api/, /setup, /login from crawlers)
- Add public/llms.txt for AI discoverability
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