docs: add claude-mem plugin documentation (automatic session memory)

Integrate claude-mem (thedotmack/claude-mem) into the guide as Section 8.2.5.
Score: 4/5 (High Value - automatic session capture fills documentation gap).

Added:
- Section 8.2.5: claude-mem plugin (automatic session memory)
  * Automatic capture via lifecycle hooks
  * AI compression + progressive disclosure (10x tokens)
  * Web dashboard at localhost:37777
  * Natural language search
  * Privacy controls (<private> tags)
  * Cost analysis ($0.15/100 obs)
  * AGPL-3.0 licensing considerations

- Memory Tools Decision Matrix (claude-mem vs Serena vs grepai)
  * 4-layer memory stack pattern
  * Integrated workflow examples
  * When to use automatic vs manual memory

- Plugin template: examples/plugins/claude-mem.md
  * Installation, configuration, troubleshooting
  * Advanced features (progressive disclosure, endless mode)
  * Export/import, cost optimization

- Resource evaluation: docs/resource-evaluations/claude-mem-evaluation.md
  * Technical analysis (fact-checked stats)
  * Comparison to existing tools
  * Integration recommendations

- reference.yaml: 14 new claude-mem entries

Changed:
- Updated search tools comparison (5 tools: rg, grepai, Serena, ast-grep, claude-mem)
- Extended feature matrix with "Auto capture" and "Web dashboard" rows

Stats (verified 2026-02-10):
- 26.5k GitHub stars, 1.8k forks
- 181 releases, 46 contributors
- Latest: v9.1.1 (Feb 7, 2026)
- License: AGPL-3.0 + PolyForm Noncommercial

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

machine-readable/reference.yaml

@@ -890,6 +890,20 @@ permissions:
 # ════════════════════════════════════════════════════════════════
 mcp:
   serena: "symbol search + session memory (write_memory/read_memory) + project indexation"
+  claude_mem: "automatic session capture + AI compression + progressive disclosure + Web dashboard (localhost:37777)"
+  claude_mem_repo: "https://github.com/thedotmack/claude-mem"
+  claude_mem_guide: "guide/ultimate-guide.md:8463"
+  claude_mem_plugin: "examples/plugins/claude-mem.md"
+  claude_mem_installation: "/plugin marketplace add thedotmack/claude-mem"
+  claude_mem_stars: "26.5k"
+  claude_mem_license: "AGPL-3.0 + PolyForm Noncommercial"
+  claude_mem_cost: "$0.15 per 100 observations (API compression)"
+  claude_mem_storage: "10-20 MB/month (light), 100-200 MB/month (heavy)"
+  claude_mem_dashboard: "http://localhost:37777"
+  claude_mem_vs_serena: "claude-mem=auto capture, Serena=manual memory"
+  claude_mem_progressive_disclosure: "3-layer retrieval: search→timeline→observations (10x token reduction)"
+  claude_mem_evaluation: "docs/resource-evaluations/claude-mem-evaluation.md"
+  claude_mem_score: "4/5 (High Value)"
   doobidoo_memory: "semantic memory search + Knowledge Graph dashboard + 13+ clients (⚠️ under testing)"
   doobidoo_install: "pip install mcp-memory-service && python -m mcp_memory_service.scripts.installation.install --quick"
   doobidoo_dashboard: "http://localhost:8000"