feat: add llms.txt standard support for AI agent discoverability (#784)

Cherry-picked website/, scripts/generate-llms-full.sh, and deploy-docs.yml
from joyshmitz's PR. Fixed workflow to trigger on main branch instead of
docs/docusaurus-site.

Features:
- Docusaurus documentation site with llms.txt support
- Environment-variable driven config (defaults to steveyegge org)
- Automated llms-full.txt generation from docs
- GitHub Pages deployment workflow

Co-authored-by: joyshmitz <joyshmitz@users.noreply.github.com>

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Executed-By: beads/crew/dave
Rig: beads
Role: crew

website/docs/recovery/index.md

@@ -0,0 +1,45 @@
+---
+sidebar_position: 1
+title: Recovery Overview
+description: Diagnose and resolve common Beads issues
+---
+
+# Recovery Overview
+
+This section provides step-by-step recovery procedures for common Beads issues. Each runbook follows a consistent format: Symptoms, Diagnosis, Solution (5 steps max), and Prevention.
+
+## Common Issues
+
+| Issue | Symptoms | Runbook |
+|-------|----------|---------|
+| Database Corruption | SQLite errors, missing data | [Database Corruption](/recovery/database-corruption) |
+| Merge Conflicts | JSONL conflicts during sync | [Merge Conflicts](/recovery/merge-conflicts) |
+| Circular Dependencies | Cycle detection errors | [Circular Dependencies](/recovery/circular-dependencies) |
+| Sync Failures | `bd sync` errors | [Sync Failures](/recovery/sync-failures) |
+
+## Quick Diagnostic
+
+Before diving into specific runbooks, try these quick checks:
+
+```bash
+# Check Beads status
+bd status
+
+# Verify daemon is running
+bd daemon status
+
+# Check for blocked issues
+bd blocked
+```
+
+:::tip
+Most issues can be diagnosed with `bd status`. Start there before following specific runbooks.
+:::
+
+## Getting Help
+
+If these runbooks don't resolve your issue:
+
+1. Check the [FAQ](/reference/faq)
+2. Search [existing issues](https://github.com/steveyegge/beads/issues)
+3. Open a new issue with diagnostic output