Adapt extension-host tests to the instance-based scripted-provider fixture

pi 0.80's Models API replaced the global api-registry with isolated Models
collections, so the shared scripted-provider test fixture no longer mutates
global state and dropped its dispose() teardown. Remove the now-stale
fx.dispose() calls from the extension-host test afterEach hooks; the host's
own dispose() still runs, and the scripted collection needs no teardown.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: rgarcia

packages/cli/test/e2e/agent-start-counter-shortcut.test.ts

@@ -50,7 +50,6 @@ let host: HarnessExtensionHost | undefined;
 afterEach(async () => {
 	await host?.dispose();
 	host = undefined;
-	await fx?.dispose();
 	fx = undefined;
 });
 

packages/cli/test/e2e/dom-table-extraction.test.ts

@@ -36,7 +36,6 @@ let host: HarnessExtensionHost | undefined;
 afterEach(async () => {
 	await host?.dispose();
 	host = undefined;
-	await fx?.dispose();
 	fx = undefined;
 });
 

packages/cli/test/e2e/form-fill-macro.test.ts

@@ -34,7 +34,6 @@ let host: HarnessExtensionHost | undefined;
 afterEach(async () => {
 	await host?.dispose();
 	host = undefined;
-	await fx?.dispose();
 	fx = undefined;
 });
 

packages/cli/test/e2e/nav-shortcut-tool.test.ts

@@ -47,7 +47,6 @@ let host: HarnessExtensionHost | undefined;
 afterEach(async () => {
 	await host?.dispose();
 	host = undefined;
-	await fx?.dispose();
 	fx = undefined;
 });
 

packages/cli/test/e2e/template-match-click.test.ts

@@ -49,7 +49,6 @@ let host: HarnessExtensionHost | undefined;
 afterEach(async () => {
 	await host?.dispose();
 	host = undefined;
-	await fx?.dispose();
 	fx = undefined;
 });
 

packages/cli/test/extension-loader.test.ts

@@ -13,7 +13,6 @@ let host: HarnessExtensionHost | undefined;
 afterEach(async () => {
 	await host?.dispose();
 	host = undefined;
-	await fx?.dispose();
 	fx = undefined;
 });
 

packages/cli/test/extension-reload.test.ts

@@ -12,7 +12,6 @@ let host: HarnessExtensionHost | undefined;
 afterEach(async () => {
 	await host?.dispose();
 	host = undefined;
-	await fx?.dispose();
 	fx = undefined;
 });
 

packages/cli/test/extensions.test.ts

@@ -15,7 +15,6 @@ let host: HarnessExtensionHost | undefined;
 afterEach(async () => {
 	await host?.dispose();
 	host = undefined;
-	await fx?.dispose();
 	fx = undefined;
 });
 

packages/cli/test/self-extend.test.ts

@@ -57,7 +57,6 @@ let host: HarnessExtensionHost | undefined;
 afterEach(async () => {
 	await host?.dispose();
 	host = undefined;
-	await fx?.dispose();
 	fx = undefined;
 });