perf(cli): cut test suite from 32s to 11s wall

Two heavy CLI tests were dominating wall time:
- chat.test.ts "--once exits with timeout note" waited the real 30s
  reply-timeout floor. Added a replyTimeoutMs option to
  runChatInteractive so the test can use 200ms.
- bundled-plugin-install.test.ts "loads the real bundled dependency
  graph plugin" runs esbuild and a live PluginLoader (~18s). Gated
  behind FUSION_RUN_SLOW_TESTS=1; the install/upgrade logic is covered
  by mocked unit tests in the same file.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/cli/src/commands/__tests__/chat.test.ts

@@ -227,12 +227,13 @@ describe("runChatInteractive", () => {
       nonInteractive: true,
       input,
       output: new PassThrough(),
-      pollIntervalMs: 1000,
+      pollIntervalMs: 10,
+      replyTimeoutMs: 200,
     });
 
     expect(code).toBe(0);
-    expect(errorSpy).toHaveBeenCalledWith("No reply within 30s");
-  }, 40_000);
+    expect(errorSpy).toHaveBeenCalledWith("No reply within 1s");
+  });
 
   it("refuses oversized messages", async () => {
     const oversized = "x".repeat(8193);

packages/cli/src/commands/chat.ts

@@ -11,6 +11,7 @@ const HISTORY_LIMIT = 20;
 export interface ChatInteractiveOptions {
   project?: string;
   pollIntervalMs?: number;
+  replyTimeoutMs?: number;
   once?: boolean;
   nonInteractive?: boolean;
   input?: NodeJS.ReadableStream;
@@ -151,7 +152,7 @@ export async function runChatInteractive(agentId: string, options: ChatInteracti
       });
 
       output.write(`you → ${agentId}: ${content}\n`);
-      const timeoutMs = Math.max(pollIntervalMs * 10, 30_000);
+      const timeoutMs = options.replyTimeoutMs ?? Math.max(pollIntervalMs * 10, 30_000);
       const replied = await waitForReply(messageStore, agentId, printedIds, output, pollIntervalMs, timeoutMs);
       if (!replied) {
         console.error(`No reply within ${Math.ceil(timeoutMs / 1000)}s`);

packages/cli/src/plugins/__tests__/bundled-plugin-install.test.ts

@@ -534,7 +534,11 @@ describe("ensureBundledDependencyGraphPluginInstalled", () => {
     expect(registerCall.path).toContain(`${HERMES_PLUGIN_ID}/bundled.js`);
   });
 
-  it("loads the real bundled dependency graph plugin and persists a started state", async () => {
+  // Heavy integration test: runs esbuild to bundle the real dependency-graph
+  // plugin and load it through a live PluginLoader. ~18s wall on a fast laptop.
+  // The other tests in this file cover the install/upgrade logic with mocks;
+  // this one is gated behind FUSION_RUN_SLOW_TESTS=1 so day-to-day runs stay fast.
+  it.skipIf(process.env.FUSION_RUN_SLOW_TESTS !== "1")("loads the real bundled dependency graph plugin and persists a started state", async () => {
     const { existsSync, mkdtempSync, statSync } = await vi.importActual<typeof import("node:fs")>("node:fs");
     const { cp, mkdir, readFile, rm, stat, copyFile } = await vi.importActual<typeof import("node:fs/promises")>("node:fs/promises");
     const { tmpdir } = await import("node:os");