feat: Add 'configuration' doc_type for project documentation

Extends project_documentation with 'configuration' type to store:
- Public/internal domains
- Component locations (VMs, services)
- Dependencies and infrastructure setup

**Changes:**
- Added 'configuration' to doc_type enum in tools/index.ts

**Use case:**
Displayed at session start via session-start script (CF-382)

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

src/tools/index.ts

@@ -924,7 +924,7 @@ export const toolDefinitions = [
       type: 'object',
       properties: {
         project: { type: 'string', description: 'Project key (e.g., CF, VPN)' },
-        doc_type: { type: 'string', enum: ['overview', 'architecture', 'guidelines', 'history'], description: 'Documentation type' },
+        doc_type: { type: 'string', enum: ['overview', 'architecture', 'guidelines', 'history', 'configuration'], description: 'Documentation type' },
         title: { type: 'string', description: 'Document title' },
         content: { type: 'string', description: 'Document content in markdown' },
         session_id: { type: 'string', description: 'Session ID (optional)' },
@@ -939,7 +939,7 @@ export const toolDefinitions = [
       type: 'object',
       properties: {
         project: { type: 'string', description: 'Project key' },
-        doc_type: { type: 'string', enum: ['overview', 'architecture', 'guidelines', 'history'], description: 'Documentation type' },
+        doc_type: { type: 'string', enum: ['overview', 'architecture', 'guidelines', 'history', 'configuration'], description: 'Documentation type' },
       },
       required: ['project', 'doc_type'],
     },