ARCH: заложить контракт MCP semantic discovery

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

@@ -659,6 +659,29 @@ Contract-layer result:
 
 This closes the misleading `capability_contract_missing` / `transition_contract_not_resolved` debug gap for the core phase18 path without changing the user-facing answer semantics.
 
+## Progress Update - 2026-04-20 MCP Discovery Contract Seed
+
+The first implementation slice of Big Block 5 added a non-runtime-disruptive contract owner for guarded MCP semantic discovery:
+
+- `assistantMcpDiscoveryPolicy.ts`
+- `assistantMcpDiscoveryPolicy.test.ts`
+
+This seed does not yet route live user traffic into discovery.
+
+It establishes the safety contract that future runtime wiring must obey:
+
+- Qwen3 may propose business-level MCP exploration primitives;
+- unregistered primitives are rejected by runtime policy;
+- raw model claims are never answer-authoritative;
+- every discovery answer must pass an evidence gate;
+- evidence must separate confirmed facts, inferred facts, and unknown facts;
+- probe execution cannot bypass the runtime-approved primitive plan.
+
+Validation:
+
+- `npm test -- assistantMcpDiscoveryPolicy.test.ts` passed 6/6;
+- `npm run build` passed.
+
 ## Execution Rule
 
 Do not implement this plan as: