ARCH: добавить MCP catalog index для discovery

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

@@ -682,6 +682,35 @@ Validation:
 - `npm test -- assistantMcpDiscoveryPolicy.test.ts` passed 6/6;
 - `npm run build` passed.
 
+## Progress Update - 2026-04-20 MCP Catalog Index Seed
+
+The second implementation slice of Big Block 5 added the first machine-readable catalog brain for guarded MCP discovery:
+
+- `assistantMcpCatalogIndex.ts`
+- `assistantMcpCatalogIndex.test.ts`
+
+The catalog does not execute 1C/MCP calls yet.
+
+It records what each reviewed discovery primitive is allowed to mean:
+
+- business purpose;
+- required grounding axes;
+- optional axes;
+- output fact kinds;
+- minimum evidence floor.
+
+This gives future planner/executor wiring a deterministic policy surface:
+
+- every discovery primitive must have a catalog contract;
+- a discovery plan can be reviewed against catalog-required axes before execution;
+- missing axes degrade to `needs_more_axes` instead of a blind query;
+- blocked discovery plans remain blocked at catalog review level.
+
+Validation:
+
+- `npm test -- assistantMcpDiscoveryPolicy.test.ts assistantMcpCatalogIndex.test.ts` passed 11/11;
+- `npm run build` passed.
+
 ## Execution Rule
 
 Do not implement this plan as: