Resolve corresponding artifact family dependencies

docs/config.md

@@ -438,7 +438,7 @@ For each `pipeline.scriptorium.artifact_families.<name>`:
 | `for_each` | string | Yes | exactly `party.characters` |
 | `output_path_pattern` | string | Yes | safe path beneath `artifacts/` with exactly one `{character_id}` token and no other brace syntax |
 | `member_vars` | map | No | maps an ordinary Scriptorium variable name to a supported canonical character selector |
-| `member_dependencies` | list | No | retained as typed family metadata; it does not yet add ordinary dependencies |
+| `member_dependencies` | list | No | unique family keys; each generated member depends on the corresponding generated member of each listed family |
 | `publish` | map | No | typed family publish metadata (`enabled`, `required`, `dest_pattern`); it does not yet create publish outputs |
 
 Generated keys are `<family>_<character_id>` and generated output paths must
@@ -452,6 +452,13 @@ Their resolved values are strings. A member variable may not reuse a static
 `vars` name; `session_id` remains owned and overwritten by Narratio as for any
 other Scriptorium artifact.
 
+Within a family only, an input source may use
+`narratio.member_artifact.<family>`. The referenced family must be named in
+that family's `member_dependencies`; resolution rewrites the source to the
+corresponding ordinary `narratio.artifact.<family>_<character_id>` source.
+This syntax is rejected in explicit artifacts and never reaches runtime stages
+or Scriptorium.
+
 ### Notifications
 
 Narratio currently supports only `notification.mode: noop`, which is also the