Implement prepare stage input resolution

internal/app/commands_test.go

@@ -172,6 +172,11 @@ inputs:
 		t.Fatalf("write session config: %v", err)
 	}
 
+	mustWriteTestFile(t, filepath.Join(dir, "speakers.yml"), "alice: alice.flac\n")
+	mustWriteTestFile(t, filepath.Join(dir, "autocorrect.yml"), "[]\n")
+	mustWriteTestFile(t, filepath.Join(dir, "glossary.yml"), "[]\n")
+	mustWriteTestFile(t, filepath.Join(dir, "audio", "alice.flac"), "audio-bytes")
+
 	return pipelinePath, sessionPath
 }
 
@@ -189,3 +194,13 @@ func writeManifestPathForExecute(t *testing.T) string {
 
 	return path
 }
+
+func mustWriteTestFile(t *testing.T, path, contents string) {
+	t.Helper()
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		t.Fatalf("mkdir %q: %v", path, err)
+	}
+	if err := os.WriteFile(path, []byte(contents), 0o644); err != nil {
+		t.Fatalf("write %q: %v", path, err)
+	}
+}

internal/app/runner_test.go

@@ -57,10 +57,19 @@ func TestExecuteStagesPlaceholderSuccessUpdatesManifest(t *testing.T) {
 		if sr.Status != manifest.StatusSucceeded {
 			t.Fatalf("stage %q status = %q, want %q", name, sr.Status, manifest.StatusSucceeded)
 		}
+		if name == "prepare" {
+			if sr.Metadata == nil || sr.Metadata["prepared"] != true {
+				t.Fatalf("prepare metadata missing prepared=true: %#v", sr.Metadata)
+			}
+			continue
+		}
 		if sr.Metadata == nil || sr.Metadata["placeholder"] != true {
 			t.Fatalf("stage %q missing placeholder metadata", name)
 		}
 	}
+	if len(m.Inputs) == 0 {
+		t.Fatalf("manifest inputs should be recorded by prepare")
+	}
 
 	if _, err := os.Stat(summary.ManifestPath); err != nil {
 		t.Fatalf("manifest file missing at %q: %v", summary.ManifestPath, err)
@@ -186,8 +195,21 @@ func testConfig(t *testing.T) *config.Config {
 	t.Helper()
 
 	workspace := t.TempDir()
+	cfgDir := t.TempDir()
+	sessionPath := filepath.Join(cfgDir, "session.yml")
+	pipelinePath := filepath.Join(cfgDir, "pipeline.yml")
+
+	mustWriteFile(t, pipelinePath, "workspace:\n  root: "+workspace+"\n")
+	mustWriteFile(t, sessionPath, "session_id: 2026-05-03\n")
+	mustWriteFile(t, filepath.Join(cfgDir, "speakers.yml"), "alice: alice.flac\n")
+	mustWriteFile(t, filepath.Join(cfgDir, "autocorrect.yml"), "[]\n")
+	mustWriteFile(t, filepath.Join(cfgDir, "glossary.yml"), "[]\n")
+	mustWriteFile(t, filepath.Join(cfgDir, "audio", "alice.flac"), "audio")
+
 	return &config.Config{
-		Pipeline: &config.PipelineConfig{Workspace: config.WorkspaceConfig{Root: workspace}},
+		Pipeline:     &config.PipelineConfig{Workspace: config.WorkspaceConfig{Root: workspace}},
+		PipelinePath: pipelinePath,
+		SessionPath:  sessionPath,
 		Session: &config.SessionConfig{
 			SessionID: "2026-05-03",
 			Inputs: config.SessionInputsConfig{
@@ -199,3 +221,13 @@ func testConfig(t *testing.T) *config.Config {
 		},
 	}
 }
+
+func mustWriteFile(t *testing.T, path, contents string) {
+	t.Helper()
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		t.Fatalf("MkdirAll(%q): %v", path, err)
+	}
+	if err := os.WriteFile(path, []byte(contents), 0o644); err != nil {
+		t.Fatalf("WriteFile(%q): %v", path, err)
+	}
+}