feat: port MCP retrieval and write hardening

- align os MCP/runtime/docs with ra-h contract
- add safe direct node lookup and context-optional flows
- gate edge and context writes behind confirmation

app/api/nodes/route.ts

@@ -3,7 +3,6 @@ import { contextService, nodeService } from '@/services/database';
 import { Node, NodeFilters } from '@/types/database';
 import { autoEmbedQueue } from '@/services/embedding/autoEmbedQueue';
 import { generateDescription } from '@/services/database/descriptionService';
-import { scheduleAutoEdgeCreation } from '@/services/agents/autoEdge';
 import { coerceDescriptionForStorage } from '@/services/database/quality';
 import { normalizeNodeLink } from '@/utils/nodeLink';
 import { buildCanonicalNodeMetadata } from '@/services/nodes/metadata';
@@ -181,11 +180,6 @@ export async function POST(request: NextRequest) {
       autoEmbedQueue.enqueue(node.id, { reason: 'node_created' });
     }
 
-    // Schedule auto-edge creation (fire-and-forget, non-blocking)
-    if (node.id) {
-      scheduleAutoEdgeCreation(node.id);
-    }
-
     return NextResponse.json({
       success: true,
       data: node,