Add PromptKit catalog commands

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Implement PromptKit comparison and catalogs
 
-Status: Stages 1–6 complete; remaining stages are planned.
+Status: Stages 1–7 complete; remaining stages are planned.
 
 ## Scope and authority
 
@@ -425,6 +425,24 @@ Compile and exercise custom prompts-only/profiles-only suites. Check a successfu
 catalog, invalid format stopping before factories, and catalog-only help omitting
 `show`. Stage 8 completes evidence. No new core public API should be necessary.
 
+**Completion evidence (2026-10-12)**
+
+- `Command` now builds `show` and `list` independently, omits absent families,
+  retains construction issues when all four callbacks are cleared, and captures
+  the caller's selectors when the command is created. Catalog commands expose
+  config, overlay, selectors, and YAML format without named-show arguments.
+- Catalog invocation checks format before suite input preparation, applies
+  captured selectors once, checks the prepared input, then creates one state and
+  calls only the selected provider. It retains diagnostics through provider and
+  cancellation failures, encodes before output, and reuses existing report
+  delivery behavior.
+- Added focused command coverage for prompts-only and profiles-only help,
+  catalog-only omission of `show`, successful preparation and provider input,
+  and invalid-format preflight before suite factories/providers.
+- `GOTOOLCHAIN=local go test -count=1 .` passed in `integrations/ckprompt`.
+  Complete lifecycle, YAML schema, cancellation, and delivery-failure coverage
+  remains assigned to Stage 8.
+
 ## Stage 8: Complete catalog invocation and presentation coverage
 
 **Outcome:** observable catalog contracts have focused coverage without freezing