feat(canvas): Custom extractor components, migrator, and MCP spec tools

Canvas Components:
- CustomExtractorNode.tsx: Node for custom Python extractors
- CustomExtractorPanel.tsx: Configuration panel for custom extractors
- ConnectionStatusIndicator.tsx: WebSocket status display
- atomizer-spec.ts: TypeScript types for AtomizerSpec v2.0

Config:
- migrator.py: Legacy config to AtomizerSpec v2.0 migration
- Updated __init__.py exports for config and extractors

MCP Tools:
- spec.ts: MCP tools for spec manipulation
- index.ts: Tool registration updates

mcp-server/atomizer-tools/src/index.ts

@@ -22,6 +22,7 @@ import { analysisTools } from "./tools/analysis.js";
 import { reportingTools } from "./tools/reporting.js";
 import { physicsTools } from "./tools/physics.js";
 import { canvasTools } from "./tools/canvas.js";
+import { specTools } from "./tools/spec.js";
 import { adminTools } from "./tools/admin.js";
 import { ATOMIZER_MODE } from "./utils/paths.js";
 
@@ -52,6 +53,7 @@ const userTools: AtomizerTool[] = [
   ...reportingTools,
   ...physicsTools,
   ...canvasTools,
+  ...specTools,
 ];
 
 const powerTools: AtomizerTool[] = [