Add trim configuration contract

internal/config/config.go

@@ -15,6 +15,7 @@ type PipelineConfig struct {
 	WhisperX     WhisperXConfig     `yaml:"whisperx"`
 	Seriatim     SeriatimConfig     `yaml:"seriatim"`
 	Audita       AuditaConfig       `yaml:"audita"`
+	Trim         *TrimConfig        `yaml:"trim"`
 	Scriptorium  *ScriptoriumConfig `yaml:"scriptorium"`
 	Analyzer     AnalyzerConfig     `yaml:"analyzer"`
 	Notification NotificationConfig `yaml:"notification"`
@@ -83,6 +84,30 @@ type AuditaConfig struct {
 	Report                   *bool    `yaml:"report"`
 }
 
+// TrimConfig configures the future trim stage boundary.
+type TrimConfig struct {
+	Enabled    bool               `yaml:"enabled"`
+	OutputPath string             `yaml:"output_path"`
+	Bounds     TrimBoundsConfig   `yaml:"bounds"`
+	Seriatim   TrimSeriatimConfig `yaml:"seriatim"`
+}
+
+// TrimBoundsConfig configures Scriptorium bounds prompt execution for trim.
+type TrimBoundsConfig struct {
+	PromptID            string `yaml:"prompt_id"`
+	ProfileID           string `yaml:"profile_id"`
+	TranscriptInputName string `yaml:"transcript_input_name"`
+	OutputPath          string `yaml:"output_path"`
+	Timeout             string `yaml:"timeout"`
+	RenderDebug         bool   `yaml:"render_debug"`
+	RenderOutputPath    string `yaml:"render_output_path"`
+}
+
+// TrimSeriatimConfig configures Seriatim options for trim output construction.
+type TrimSeriatimConfig struct {
+	Report *bool `yaml:"report"`
+}
+
 // ScriptoriumConfig configures Scriptorium-backed artifact generation.
 type ScriptoriumConfig struct {
 	Binary      string                               `yaml:"binary"`