feat: Implement node deletion with shared modal and fix SurrealDB RecordId handling

Implements complete node deletion functionality for both galaxy view and debug panel:

**Core Changes:**
- Created shared DeleteNodeModal component used by both ThoughtGalaxy and UserMenu
- Modal provides consistent UX with proper confirmation messaging
- Deletion follows write-through cache pattern: ATproto first, then SurrealDB

**SurrealDB RecordId Fixes:**
- Fixed SELECT query to use type::thing($table, $recordId) for UUID-based RecordIds
- Fixed DELETE query to use type::thing() instead of db.delete() to handle dashes in UUIDs
- Without type::thing(), SurrealDB interprets dashes as subtraction operators

**Testing & Documentation:**
- Added comprehensive Magnitude tests for delete functionality (galaxy view and debug panel)
- Updated CLAUDE.md with complete testing workflow documentation
- Added pre-commit checklist requiring database verification and test execution
- Documented PlaywrightMCP manual testing process before Magnitude test writing

**Database Setup:**
- Configured docker-compose.yml to use environment variables for credentials
- Updated namespace/database to match .env configuration (ponderants/main)

**File Changes:**
- app/api/nodes/[id]/route.ts: Fixed RecordId query patterns (SELECT and DELETE)
- components/DeleteNodeModal.tsx: New shared modal component
- components/ThoughtGalaxy.tsx: Uses shared DeleteNodeModal
- components/UserMenu.tsx: Replaced browser confirm() with shared DeleteNodeModal
- tests/magnitude/03-delete-node.mag.ts: Added debug panel delete test
- AGENTS.md: Added testing workflow and pre-commit checklist documentation
- docker-compose.yml: Environment variable configuration

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

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

docker-compose.yml

@@ -8,12 +8,27 @@ services:
       - --log
       - trace
       - --user
-      - root
+      - ${SURREALDB_USER}
       - --pass
-      - root
+      - ${SURREALDB_PASS}
       - memory
+    volumes:
+      - ./surreal/data:/data
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
       interval: 10s
       timeout: 5s
       retries: 5
+
+  surrealmcp:
+    image: surrealdb/surrealmcp:latest
+    command: >
+      start
+        --bind-address 0.0.0.0:8080
+        --server-url http://localhost:8080
+        -e ws://surrealdb:8000/rpc
+        --ns ${SURREALDB_NS} --db ${SURREALDB_DB} -u ${SURREALDB_USER} -p ${SURREALDB_PASS}
+    ports:
+      - "8080:8080"
+    depends_on:
+      - surrealdb