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>

tests/magnitude/03-delete-node.mag.ts

@@ -135,3 +135,70 @@ test('Node deletion removes associated links', async (agent) => {
   await agent.check('The link between the nodes is no longer visible');
   await agent.check('Only one node remains in the galaxy');
 });
+
+test('User can delete node from debug panel in Profile menu', async (agent) => {
+  // Act: Log in
+  await agent.act('Navigate to /login');
+  await agent.act(`Type "${TEST_HANDLE}" into the "Your Handle" input field`);
+  await agent.act('Click the "Log in with Bluesky" button');
+  await agent.check('The page URL contains "bsky.social"');
+  await agent.act(`Type "${TEST_HANDLE}" into the username/identifier field`);
+  await agent.act(`Type "${TEST_PASSWORD}" into the password field`);
+  await agent.act('Click the submit/authorize button');
+  await agent.check('The page URL contains "/chat"');
+
+  // Act: Create a test node via chat
+  await agent.act('Type "Test node for debug panel deletion" into the chat input');
+  await agent.act('Press Enter or click send');
+  await agent.check('AI responds with a message');
+
+  // Act: Trigger node creation and publish
+  await agent.act('Wait for the AI to suggest creating a node or manually trigger node creation');
+  await agent.check('A node draft is created in the editor');
+  await agent.act('Click the "Publish" button');
+  await agent.check('A success notification appears');
+
+  // Act: Open Profile menu
+  await agent.act('Click the "Profile" button in the navigation sidebar');
+  await agent.check('The Profile menu opens');
+
+  // Check: Verify debug panel is visible (development mode only)
+  await agent.check('A "Debug: SurrealDB Nodes" section is visible');
+
+  // Act: Fetch nodes from debug panel
+  await agent.act('Click the "Fetch Nodes" button');
+  await agent.check('The button shows a count greater than 0');
+  await agent.check('At least one node is listed in the debug panel');
+
+  // Check: Verify the test node appears
+  await agent.check('The node "Test node for debug panel deletion" is visible');
+
+  // Act: Click delete button in debug panel
+  await agent.act('Click the "Delete" button next to the test node');
+
+  // Check: Verify delete confirmation modal appears
+  await agent.check('A delete confirmation modal appears');
+  await agent.check('The modal is displayed above the profile menu');
+  await agent.check('The modal shows the node title "Test node for debug panel deletion"');
+  await agent.check('The modal explains this will remove the post from Bluesky');
+  await agent.check('The modal shows "This action cannot be undone"');
+  await agent.check('The modal has a "Delete Permanently" button');
+  await agent.check('The modal has a "Cancel" button');
+
+  // Act: Confirm deletion
+  await agent.act('Click the "Delete Permanently" button');
+
+  // Check: Verify deletion succeeded
+  await agent.check('A success notification appears saying "Node deleted"');
+  await agent.check('The notification says "Node has been deleted from Bluesky and your galaxy"');
+  await agent.check('The modal closes');
+
+  // Check: Verify node is removed from debug panel
+  await agent.check('The "Fetch Nodes" button shows a count of 0 or the node is no longer in the list');
+
+  // Act: Verify node is deleted from Bluesky and database
+  await agent.act('Refresh the page');
+  await agent.act('Click the "Profile" button again');
+  await agent.act('Click the "Fetch Nodes" button');
+  await agent.check('The node "Test node for debug panel deletion" is not in the list');
+});