Derive family member publish destinations

internal/config/artifact_families_test.go

@@ -334,6 +334,82 @@ func TestFamilyPublishRulesExpandToConcreteArtifacts(t *testing.T) {
 	}
 }
 
+func TestExplicitFamilyMemberPublishDestinationResolution(t *testing.T) {
+	dir := t.TempDir()
+	writePartyResolutionFile(t, filepath.Join(dir, "party.yml"), `schema_version: narratio.party.v1
+characters:
+  alice:
+    player: {name: Alice Player}
+    character:
+      name: Alice
+      classes: [{name: wizard}]
+`)
+
+	for _, test := range []struct {
+		name     string
+		source   string
+		dest     string
+		wantDest string
+		wantErr  string
+	}{
+		{
+			name:     "derive generated member output",
+			source:   "narratio.artifact.meta_alice",
+			wantDest: "artifacts/alice.md",
+		},
+		{
+			name:     "preserve explicit override",
+			source:   "narratio.artifact.meta_alice",
+			dest:     "published/alice-summary.md",
+			wantDest: "published/alice-summary.md",
+		},
+		{
+			name:    "reject unknown source",
+			source:  "narratio.artifact.missing",
+			wantErr: "is unsupported",
+		},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			publishDestination := ""
+			if test.dest != "" {
+				publishDestination = "      dest: " + test.dest + "\n"
+			}
+			pipeline := artifactFamilyPipelineYAML(`
+  meta:
+    enabled: true
+    for_each: party.characters
+    prompt_id: dnd.meta
+    profile_id: production
+    output_path_pattern: artifacts/{character_id}.md
+`) + `
+publish:
+  outputs:
+    - source: ` + test.source + "\n" + publishDestination
+			pipelinePath, campaignPath, sessionPath := writeArtifactFamilyConfig(t, dir, pipeline)
+			cfg, err := LoadWithSessionOptions(pipelinePath, campaignPath, sessionPath, SessionLoadOptions{})
+			if test.wantErr != "" {
+				if err == nil || !strings.Contains(err.Error(), test.wantErr) {
+					t.Fatalf("LoadWithSessionOptions() error = %v, want %q", err, test.wantErr)
+				}
+				return
+			}
+			if err != nil {
+				t.Fatalf("LoadWithSessionOptions() error = %v", err)
+			}
+			if got := cfg.Pipeline.Publish.Outputs[0].Dest; got != test.wantDest {
+				t.Fatalf("resolved runtime destination = %q, want %q", got, test.wantDest)
+			}
+			effective, err := MarshalEffectivePipeline(cfg.Pipeline)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if !strings.Contains(string(effective), "dest: "+test.wantDest+"\n") {
+				t.Fatalf("effective pipeline omitted resolved destination:\n%s", effective)
+			}
+		})
+	}
+}
+
 const validFamilyYAML = `
   character_meta:
     enabled: true