feat(CF-524): Add project_archive MCP method

Implements complete project archival workflow:
- Migration 024: Add archival fields to projects table
- New project-archive.ts tool coordinating:
  * Tarball creation via shell
  * S3 upload with vault credentials
  * Database metadata tracking
  * Optional local deletion
  * Cleanup of temp files
- Registered in tool definitions and handlers

Replaces manual archival process used for Fireberries/CyprusPulse.

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

src/tools/index.ts

@@ -1059,4 +1059,20 @@ export const toolDefinitions = [
       required: ['id'],
     },
   },
+
+  // Project Archival
+  {
+    name: 'project_archive',
+    description: 'Archive complete project to S3 with database tracking. Creates tarball, uploads to s3://agiliton-archive/projects/, updates database, and optionally deletes local copy.',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        project_key: { type: 'string', description: 'Project key (must exist in database)' },
+        project_path: { type: 'string', description: 'Absolute path to project directory' },
+        delete_local: { type: 'boolean', description: 'Delete local project after successful archive (default: false)' },
+        session_id: { type: 'string', description: 'Session ID performing the archival (optional)' },
+      },
+      required: ['project_key', 'project_path'],
+    },
+  },
 ];