ARCH: добавить pilot executor MCP discovery

docs/ARCH/11 - architecture_turnaround/14 - semantic_dialog_authority_recovery_plan_2026-04-19.md

@@ -759,6 +759,35 @@ Validation:
 - `npm test -- assistantMcpDiscoveryPolicy.test.ts assistantMcpCatalogIndex.test.ts assistantMcpDiscoveryPlanner.test.ts assistantMcpDiscoveryRuntimeAdapter.test.ts` passed 21/21;
 - `npm run build` passed.
 
+## Progress Update - 2026-04-20 MCP Discovery Pilot Executor
+
+The fifth implementation slice of Big Block 5 added the first isolated execution pilot:
+
+- `assistantMcpDiscoveryPilotExecutor.ts`
+- `assistantMcpDiscoveryPilotExecutor.test.ts`
+
+This pilot is still not wired into the hot user-facing assistant runtime.
+
+It can execute only one intentionally narrow primitive path:
+
+- `counterparty_lifecycle_query_documents_v1`
+- lifecycle/activity-duration turn meaning;
+- `query_documents` through injected MCP dependencies;
+- all other planned primitives remain skipped in the pilot until dedicated executors exist.
+
+The pilot preserves the safety rules from the previous layers:
+
+- it will not execute when dry-run status needs clarification;
+- it will not execute unsupported ready plans;
+- MCP errors become limitations, not facts;
+- legal registration age remains an unknown fact;
+- business activity duration may only be treated as a bounded inference from confirmed 1C activity rows.
+
+Validation:
+
+- `npm test -- assistantMcpDiscoveryPolicy.test.ts assistantMcpCatalogIndex.test.ts assistantMcpDiscoveryPlanner.test.ts assistantMcpDiscoveryRuntimeAdapter.test.ts assistantMcpDiscoveryPilotExecutor.test.ts` passed 25/25;
+- `npm run build` passed.
+
 ## Execution Rule
 
 Do not implement this plan as: