feat(coding-agent): allow project trust extensions to defer

packages/coding-agent/src/core/extensions/index.ts

@@ -100,6 +100,7 @@ export type {
 	ModelSelectSource,
 	ProjectTrustContext,
 	ProjectTrustEvent,
+	ProjectTrustEventDecision,
 	ProjectTrustEventResult,
 	ProjectTrustHandler,
 	// Provider Registration

packages/coding-agent/src/core/extensions/runner.ts

@@ -202,13 +202,16 @@ export async function emitProjectTrustEvent(
 	const errors: ExtensionError[] = [];
 	for (const ext of extensionsResult.extensions) {
 		// A single extension may register multiple handlers for the same event.
-		// The first project_trust handler that returns a decision wins.
+		// The first project_trust handler that returns yes/no wins; undecided falls through.
 		const handlers = ext.handlers.get("project_trust");
 		if (!handlers || handlers.length === 0) continue;
 
 		for (const handler of handlers) {
 			try {
 				const handlerResult = (await handler(event, ctx)) as ProjectTrustEventResult;
+				if (handlerResult.trusted === "undecided") {
+					continue;
+				}
 				return { result: handlerResult, errors };
 			} catch (error) {
 				errors.push({

packages/coding-agent/src/core/extensions/types.ts

@@ -503,8 +503,10 @@ export interface ProjectTrustEvent {
 	cwd: string;
 }
 
+export type ProjectTrustEventDecision = "yes" | "no" | "undecided";
+
 export interface ProjectTrustEventResult {
-	trusted: boolean;
+	trusted: ProjectTrustEventDecision;
 	remember?: boolean;
 }