Expand canonical party artifact families

docs/internal/stage-analyze.md

@@ -7,7 +7,9 @@ dependency order, and safely materialize validated outputs.
 
 ## Inputs
 
-- configured artifacts from `pipeline.scriptorium.artifacts`
+- ordinary configured artifacts from `pipeline.scriptorium.artifacts`; canonical
+  party artifact families have already expanded into this map during
+  configuration resolution
 - optional selected artifact keys supplied through the stage environment
 - built-in, configured, extraction, and previous-session source references in
   artifact inputs
@@ -165,7 +167,8 @@ Supported source families:
 ## Related Contracts And Tests
 
 - [Configuration](../config.md#scriptorium-artifact-entries) owns artifact
-  fields and source-selection rules.
+  fields and source-selection rules, including
+  [artifact families](../config.md#scriptorium-artifact-families).
 - [CLI](../cli.md) owns user-visible artifact selection.
 - [Scriptorium](../integrations/scriptorium.md) owns the subprocess contract.
 - Implementation and tests: `internal/stage/analyze.go`,