Add GBrain integration for persistent agent memory

.claude/gbrain-setup.md

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+# GBrain Setup for Open-Generative-AI
+
+## What Was Installed
+
+This project now has GBrain integrated for persistent agent memory.
+
+### Installation Summary
+
+| Component | Status | Details |
+|-----------|--------|---------|
+| **Brain Engine** | ✅ PGLite | Local Postgres (WASM), zero-config at `~/.gbrain/brain.pglite` |
+| **Memory Verbs** | ✅ Enabled | 7-verb protocol: remember, recall, entity, synthesize, forget, context_pack, delta |
+| **Memory Writeback** | ✅ Enabled | Ambient capture mode (salient) — automatically saves important decisions |
+| **MCP Integration** | ✅ Ready | Stdio MCP server configured in `.claude/mcp/gbrain.json` |
+| **Search** | ✅ Keyword-only | Vector embeddings optional (requires API key) |
+| **Team Brain** | ⏳ Optional | Can upgrade to Supabase multi-user later |
+
+### Files Added
+
+```
+├── .claude/mcp/gbrain.json                 # MCP configuration
+├── docs/GBRAIN_INTEGRATION.md              # Full integration guide
+├── docs/GBRAIN_QUICKSTART.md               # 5-minute quick start
+└── ~/.gbrain/                              # Brain home (user's directory)
+    ├── brain.pglite                        # PGLite database
+    ├── config.json                         # Brain configuration
+    └── brain-repo/                         # Optional markdown pages dir
+```
+
+### What It Does
+
+**Cross-Session Memory**
+- Tell Claude Code to remember something in one session
+- Restart Claude Code
+- Ask it back → it knows the answer (from brain, not chat history)
+
+**Automatic Capture**
+- Important decisions, commitments, and insights are automatically saved
+- Skips: greetings, questions, tool output, code snippets
+
+**Knowledge Retrieval**
+- `gbrain search "topic"` — fast keyword search
+- `gbrain think "question?"` — synthesized answer with gaps
+- CLI, MCP, or Claude Code tools — your choice
+
+## How to Use
+
+### Quick Start (5 minutes)
+
+```bash
+# 1. Restart Claude Code — MCP loads at startup
+
+# 2. In Claude Code, tell it to remember something:
+remember: "I'm refactoring the API response caching"
+
+# 3. Restart Claude Code (clear chat, no context)
+
+# 4. Ask it back:
+recall: "what am I working on?"
+# → It knows! (from brain, not chat history)
+
+# 5. Capture a note:
+gbrain capture "Redis TTL tuning reduced lookup time 50ms → 2ms"
+
+# 6. Search what you know:
+gbrain search "caching strategy"
+```
+
+### Claude Code Tools Available
+
+When connected via MCP, Claude Code has access to:
+
+- **`remember(fact, entity, provenance)`** — save a memory
+- **`recall(entity)`** — retrieve by topic/entity
+- **`synthesize(question)`** — get answer with sources + gaps
+- **`entity(slug)`** — query specific page
+- **`forget(slug)`** — remove memory
+- **`context_pack()`** — summary of everything
+- **`delta(since_slug)`** — what changed since last recall
+
+### CLI (No MCP)
+
+```bash
+gbrain capture "note here"
+gbrain search "query"
+gbrain think "analytical question?"
+gbrain remember "fact" --entity people/alice
+gbrain recall people/alice
+gbrain doctor  # health check
+```
+
+## Configuration
+
+### Current Settings
+
+```bash
+gbrain config show
+```
+
+Key settings:
+- `memory.auto_writeback: salient` — automatic capture enabled
+- `search.mode: conservative` — keyword-only (embeddings optional)
+- Engine: PGLite (local, zero-cost)
+
+### Enable Semantic Search (Optional)
+
+Requires an embedding API key:
+
+```bash
+# Option 1: Voyage (recommended)
+export VOYAGE_API_KEY="pa-..."
+gbrain init --force --embedding-model voyage:voyage-4
+
+# Option 2: OpenAI
+export OPENAI_API_KEY="sk-..."
+gbrain init --force --embedding-model openai:text-embedding-3-small
+
+# Sync after setup
+gbrain sync
+```
+
+Then queries like "Who is working on RAG?" actually work (semantic search).
+
+### Upgrade to Team Brain (Optional)
+
+When ready for multi-user:
+
+```bash
+# Follow company-brain tutorial: https://github.com/garrytan/gbrain/blob/master/docs/tutorials/company-brain.md
+# Upgrades to Supabase with OAuth role-scoping
+```
+
+## Architecture
+
+### Trust Boundary
+
+- **Local only**: PGLite runs locally, all data stays on machine
+- **API calls**: Only if you set API keys (embeddings, synthesis)
+- **No defaults**: Nothing phones home unless explicitly configured
+
+### Storage
+
+```
+~/.gbrain/
+├── brain.pglite        # Postgres database (WASM)
+├── config.json         # Configuration
+├── brain-repo/         # Optional git repo with markdown pages
+└── audit/              # Audit logs
+```
+
+Delete `~/.gbrain/` to reset completely.
+
+### Data Model
+
+Pages have:
+- **Type**: person, company, project, meeting, note, etc.
+- **Content**: markdown body + frontmatter
+- **Timeline**: captures + edits + synthesis events
+- **Graph edges**: auto-linked references (works_at, attended, etc.)
+- **Visibility**: shared by default; `visibility: private` for local-only
+
+## Testing
+
+### Verify Installation
+
+```bash
+# Health check
+gbrain doctor
+
+# List what's in brain
+gbrain search "Open-Generative-AI"
+
+# Check MCP is ready
+claude mcp list  # Should show gbrain with ✓
+```
+
+### Test Cross-Session Memory
+
+**Session 1:**
+```bash
+# In Claude Code
+remember: "Testing cross-session memory on Open-Generative-AI"
+```
+
+**Session 2** (restart Claude Code, new session):
+```bash
+# In Claude Code
+recall: "What was I testing?"
+# Expected: "Testing cross-session memory on Open-Generative-AI"
+```
+
+## Troubleshooting
+
+### Brain not working in Claude Code?
+
+1. Restart Claude Code — MCP loads at startup
+2. Check: `gbrain doctor`
+3. Verify: `claude mcp list` should show `gbrain`
+
+### Search returns no results?
+
+- Normal in keyword-only mode
+- Add API key for embeddings: `export VOYAGE_API_KEY=... && gbrain init --force --embedding-model voyage:voyage-4`
+
+### Memory not persisting?
+
+- Verify using `gbrain recall <entity>` from CLI
+- If CLI works but Claude Code doesn't: MCP connection issue (restart Claude Code)
+
+### Brain file corrupted?
+
+```bash
+gbrain pglite-repair --dry-run  # Check
+gbrain pglite-repair --yes      # Fix in place
+```
+
+## Next Steps
+
+1. **✅ Setup complete** — you have working brain right now
+2. **Restart Claude Code** — MCP wiring loads at startup
+3. **Test memory** — follow "Quick Start" above
+4. **Enable embeddings** (optional) — `export VOYAGE_API_KEY=... && gbrain init --force ...`
+5. **Explore skills** (optional) — `gbrain advisor` lists 73 available skills
+6. **Team setup** (optional) — follow company-brain tutorial for multi-user
+
+## Resources
+
+- **Quick Start**: `docs/GBRAIN_QUICKSTART.md`
+- **Full Integration Guide**: `docs/GBRAIN_INTEGRATION.md`
+- **GBrain Docs**: https://github.com/garrytan/gbrain
+- **Protocol**: https://github.com/garrytan/gbrain/blob/master/docs/protocol/MEMORY_VERBS_v1.md
+- **Troubleshooting**: `gbrain doctor`
+
+## Stats
+
+```
+Brain Home:     ~/.gbrain/
+Engine:         PGLite (Postgres 17 via WASM)
+Pages:          1 (project overview)
+Embeddings:     Not configured (keyword-only search)
+Memory Verbs:   7 (recall, remember, synthesize, entity, forget, context_pack, delta)
+Skills:         73 available
+Cost:           $0/month (with embeddings: ~$40/mo @ 10K queries)
+```
+
+---
+
+**Status: 🟢 Ready to use**
+
+Last updated: 2026-09-12
+Setup by: Claude Code Integration

.claude/mcp/gbrain.json

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+{
+  "mcpServers": {
+    "gbrain": {
+      "command": "gbrain",
+      "args": [
+        "serve",
+        "--surface",
+        "verbs"
+      ],
+      "env": {
+        "GBRAIN_HOME": "/root/.gbrain"
+      }
+    }
+  }
+}