feat: add branchSummary.skipPrompt setting to skip summarization prompt (#1792)

When enabled, /tree navigation skips the 'Summarize branch?' prompt and
defaults to no summary, reducing friction for users who never want branch
summaries.

Closes #1791

packages/coding-agent/docs/settings.md

@@ -69,6 +69,7 @@ Edit directly or use `/settings` for common options.
 | Setting | Type | Default | Description |
 |---------|------|---------|-------------|
 | `branchSummary.reserveTokens` | number | `16384` | Tokens reserved for branch summarization |
+| `branchSummary.skipPrompt` | boolean | `false` | Skip "Summarize branch?" prompt on `/tree` navigation (defaults to no summary) |
 
 ### Retry
 

packages/coding-agent/src/core/settings-manager.ts

@@ -12,6 +12,7 @@ export interface CompactionSettings {
 
 export interface BranchSummarySettings {
 	reserveTokens?: number; // default: 16384 (tokens reserved for prompt + LLM response)
+	skipPrompt?: boolean; // default: false - when true, skips "Summarize branch?" prompt and defaults to no summary
 }
 
 export interface RetrySettings {
@@ -607,12 +608,17 @@ export class SettingsManager {
 		};
 	}
 
-	getBranchSummarySettings(): { reserveTokens: number } {
+	getBranchSummarySettings(): { reserveTokens: number; skipPrompt: boolean } {
 		return {
 			reserveTokens: this.settings.branchSummary?.reserveTokens ?? 16384,
+			skipPrompt: this.settings.branchSummary?.skipPrompt ?? false,
 		};
 	}
 
+	getBranchSummarySkipPrompt(): boolean {
+		return this.settings.branchSummary?.skipPrompt ?? false;
+	}
+
 	getRetryEnabled(): boolean {
 		return this.settings.retry?.enabled ?? true;
 	}

packages/coding-agent/src/modes/interactive/interactive-mode.ts

@@ -3448,6 +3448,8 @@ export class InteractiveMode {
 					let wantsSummary = false;
 					let customInstructions: string | undefined;
 
+					// Check if we should skip the prompt (user preference to always default to no summary)
+					if (!this.settingsManager.getBranchSummarySkipPrompt()) {
 						while (true) {
 							const summaryChoice = await this.showExtensionSelector("Summarize branch?", [
 								"No summary",
@@ -3474,6 +3476,7 @@ export class InteractiveMode {
 							// User made a complete choice
 							break;
 						}
+					}
 
 					// Set up escape handler and loader if summarizing
 					let summaryLoader: Loader | undefined;