fix: call NotifyEventStored in MCP profiler test

After PR #328 moved storeProfile from Handle() to OnEventStored(), the MCP
test's ingestViaHandler helper no longer populated profiler-specific tables.
Add the missing NotifyEventStored call to match the real HTTP server flow.

Author: butschster

internal/mcp/mcp_test.go

@@ -72,6 +72,7 @@ func ingestViaHandler(t *testing.T, reg *module.Registry, store event.Store, req
 			if err := store.Store(context.Background(), ev); err != nil {
 				t.Fatal(err)
 			}
+			reg.NotifyEventStored(ev)
 			return ev.UUID
 		}
 	}