Adopt ConfigKit overlays for pipeline selection

docs/troubleshooting.md

@@ -102,7 +102,7 @@ Safe fix:
 
 Relevant reference: [Canonical Party Input](./integrations/party.md).
 
-## Unexpected imported or profile value
+## Unexpected imported or overlay value
 
 Symptom:
 
@@ -112,21 +112,21 @@ Symptom:
 Diagnostics:
 
 ```bash
-narratio config sources --config /path/pipeline.yml --profile testing
+narratio config sources --config /path/pipeline.yml --overlay testing
 ```
 
 Add `--campaign` or `--campaign-file` when the pipeline has party-driven
 artifact families. The output identifies each effective logical field's root,
-import, profile, default, campaign, party, or family source without printing
+import, overlay, default, campaign, party, or family source without printing
 the field value or credential contents.
 
 Safe fix:
 
 - move a duplicated base field so it has one owner;
-- correct the selected profile or its overlay; or
+- correct the selected overlay; or
 - correct the campaign party/family declaration that owns generated values.
 
-To review what would actually change before switching profiles, run `config
+To review what would actually change before switching overlays, run `config
 diff` with the same pipeline and campaign selectors. It compares normalized
 effective values rather than YAML formatting or source-file layout.