docs: add Kairn memory MCP + resource evaluations + guide updates
- guide/ultimate-guide.md §10.2: Add Kairn (knowledge graph memory with biological decay)
- Typed relationships (depends-on, resolves, causes), 18 MCP tools
- Updated comparison table: Serena / grepai / doobidoo / Kairn
- Added decision routing for long-term memory + causality tracking
- guide/ultimate-guide.md §5.1: Add real-world CLAUDE.md migration example (Avo, 600-line → 15 path-scoped files)
- guide/ai-ecosystem.md: Minor update
- machine-readable/reference.yaml: Add Kairn entries
- examples/config/mcp.json: Add Kairn MCP config
- docs/resource-evaluations/: Add 2 new evaluations (context-evaluator-packmind, kairn-memory-mcp)
- docs/resource-evaluations/agents-md-empirical-study: Add community reception section
- docs/resource-evaluations/2026-02-23-agentsview: Minor fix
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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