Demonstrate PromptKit catalogs and smoke tests

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Dependency upgrades, discovery, and smoke testing implementation plan
 
-Status: Stages 1–14 complete; Stage 15 is next.
+Status: Stages 1–15 complete; Stage 16 is next.
 
 ## Authority and baseline
 
@@ -738,6 +738,17 @@ native API's success criteria.
 **Complete when:** the consumer demonstrates the new interfaces with little
 application plumbing and no model-service prerequisite.
 
+**Completed:** 2026-10-17. The composed consumer now explicitly wires smoke
+testing with a nil request builder and exposes backend, namespace, collection,
+and namespace-filtered prompt discovery using one synthetic collection. Its
+shared invocation state carries an injected in-memory PromptKit client; tests
+confirm metadata and requirements leave it unused and smoke inference invokes
+it. The README documents ID-only inspection, optional version metadata, all
+catalogs, namespace filtering, typed builder customization, and single and
+aggregate smoke commands. The composed test suite passed, as did the documented
+offline discovery, inspection, requirements, and smoke commands. Native HTTP
+checks reported their configured unsupported/not-applicable observations.
+
 ## Stage 16: Reconcile dependency graphs and notices
 
 **Primary files:** all three module manifests/sums and attribution documents.