Add trim CLI command

internal/config/config_test.go

@@ -612,6 +612,105 @@ func TestCoalesceGapRejectsInvalidOverride(t *testing.T) {
 	}
 }
 
+func TestNewTrimConfigRequiresInputAndOutput(t *testing.T) {
+	dir := t.TempDir()
+	input := writeTempFile(t, dir, "input.json")
+	output := filepath.Join(dir, "trimmed.json")
+
+	_, err := NewTrimConfig(TrimOptions{
+		OutputFile: output,
+		Keep:       "1",
+	})
+	if err == nil || !strings.Contains(err.Error(), "--input-file is required") {
+		t.Fatalf("expected input-file required error, got %v", err)
+	}
+
+	_, err = NewTrimConfig(TrimOptions{
+		InputFile: input,
+		Keep:      "1",
+	})
+	if err == nil || !strings.Contains(err.Error(), "--output-file is required") {
+		t.Fatalf("expected output-file required error, got %v", err)
+	}
+}
+
+func TestNewTrimConfigRequiresExactlyOneSelectorFlag(t *testing.T) {
+	dir := t.TempDir()
+	input := writeTempFile(t, dir, "input.json")
+	output := filepath.Join(dir, "trimmed.json")
+
+	_, err := NewTrimConfig(TrimOptions{
+		InputFile:  input,
+		OutputFile: output,
+	})
+	if err == nil || !strings.Contains(err.Error(), "exactly one of --keep or --remove is required") {
+		t.Fatalf("expected missing selector error, got %v", err)
+	}
+
+	_, err = NewTrimConfig(TrimOptions{
+		InputFile:  input,
+		OutputFile: output,
+		Keep:       "1",
+		Remove:     "2",
+	})
+	if err == nil || !strings.Contains(err.Error(), "mutually exclusive") {
+		t.Fatalf("expected mutually exclusive selector error, got %v", err)
+	}
+}
+
+func TestNewTrimConfigAcceptsOutputSchemaOverride(t *testing.T) {
+	dir := t.TempDir()
+	input := writeTempFile(t, dir, "input.json")
+	output := filepath.Join(dir, "trimmed.json")
+	reportPath := filepath.Join(dir, "report.json")
+
+	cfg, err := NewTrimConfig(TrimOptions{
+		InputFile:    input,
+		OutputFile:   output,
+		ReportFile:   reportPath,
+		Remove:       "3-5",
+		OutputSchema: OutputSchemaMinimal,
+		AllowEmpty:   true,
+	})
+	if err != nil {
+		t.Fatalf("config failed: %v", err)
+	}
+	if cfg.Mode != "remove" {
+		t.Fatalf("mode = %q, want remove", cfg.Mode)
+	}
+	if cfg.Selector != "3-5" {
+		t.Fatalf("selector = %q, want 3-5", cfg.Selector)
+	}
+	if cfg.OutputSchema != OutputSchemaMinimal {
+		t.Fatalf("output schema = %q, want %q", cfg.OutputSchema, OutputSchemaMinimal)
+	}
+	if !cfg.AllowEmpty {
+		t.Fatal("allow empty should be true")
+	}
+	if cfg.ReportFile != reportPath {
+		t.Fatalf("report file = %q, want %q", cfg.ReportFile, reportPath)
+	}
+}
+
+func TestNewTrimConfigRejectsInvalidOutputSchemaOverride(t *testing.T) {
+	dir := t.TempDir()
+	input := writeTempFile(t, dir, "input.json")
+	output := filepath.Join(dir, "trimmed.json")
+
+	_, err := NewTrimConfig(TrimOptions{
+		InputFile:    input,
+		OutputFile:   output,
+		Keep:         "1",
+		OutputSchema: "compact",
+	})
+	if err == nil {
+		t.Fatal("expected output schema validation error")
+	}
+	if !strings.Contains(err.Error(), "--output-schema must be one of") {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
 func assertPositiveFloatEnvValidation(t *testing.T, envName string) {
 	t.Helper()