fix: expose abort signal to extensions closes #2660

packages/coding-agent/test/extensions-runner.test.ts

@@ -71,6 +71,7 @@ describe("ExtensionRunner", () => {
 	const extensionContextActions: ExtensionContextActions = {
 		getModel: () => undefined,
 		isIdle: () => true,
+		getSignal: () => undefined,
 		abort: () => {},
 		hasPendingMessages: () => false,
 		shutdown: () => {},
@@ -399,6 +400,26 @@ describe("ExtensionRunner", () => {
 		});
 	});
 
+	describe("context creation", () => {
+		it("exposes the current abort signal on ExtensionContext", async () => {
+			const result = await discoverAndLoadExtensions([], tempDir, tempDir);
+			const runner = new ExtensionRunner(result.extensions, result.runtime, tempDir, sessionManager, modelRegistry);
+			const controller = new AbortController();
+
+			runner.bindCore(extensionActions, {
+				...extensionContextActions,
+				getSignal: () => controller.signal,
+			});
+
+			const ctx = runner.createContext();
+			expect(ctx.signal).toBe(controller.signal);
+			expect(ctx.signal?.aborted).toBe(false);
+
+			controller.abort();
+			expect(ctx.signal?.aborted).toBe(true);
+		});
+	});
+
 	describe("error handling", () => {
 		it("calls error listeners when handler throws", async () => {
 			const extCode = `

packages/coding-agent/test/trigger-compact-extension.test.ts

@@ -11,6 +11,7 @@ function createContext(tokens: number | null, compact = vi.fn()): ExtensionConte
 		modelRegistry: {} as ExtensionContext["modelRegistry"],
 		model: undefined,
 		isIdle: () => true,
+		signal: undefined,
 		abort: vi.fn(),
 		hasPendingMessages: () => false,
 		shutdown: vi.fn(),