fix(tui): keep the read-only /add-dir forms session-less

The bare and `list` forms already tolerate a missing session, but the
blanket lazy-create gate forced a session (or failed with LLM-not-set)
before they could run. Only the path-adding form needs a live session, so
it now lazy-creates inside the handler instead of in the dispatch
preflight.

apps/kimi-code/src/tui/commands/add-dir.ts

@@ -6,7 +6,7 @@ type AddDirChoice = 'session' | 'remember' | 'cancel';
 
 export async function handleAddDirCommand(host: SlashCommandHost, args: string): Promise<void> {
   const input = args.trim();
-  const session = host.session;
+  let session = host.session;
 
   if (input.length === 0 || input.toLowerCase() === 'list') {
     const additionalDirs = session?.summary?.additionalDirs ?? [];
@@ -19,8 +19,14 @@ export async function handleAddDirCommand(host: SlashCommandHost, args: string):
   }
 
   if (session === undefined) {
-    host.showError(NO_ACTIVE_SESSION_MESSAGE);
-    return;
+    if (!host.engineV2) {
+      host.showError(NO_ACTIVE_SESSION_MESSAGE);
+      return;
+    }
+    // The path-adding form needs a live session; lazy-create it on first use
+    // (the read-only `list`/bare forms above tolerate a missing session).
+    session = await host.ensureSession();
+    if (session === undefined) return;
   }
 
   host.mountEditorReplacement(

apps/kimi-code/src/tui/commands/dispatch.ts

@@ -310,7 +310,6 @@ async function ensureSessionForCommand(host: SlashCommandHost): Promise<Session
 
 /** Builtin commands that need an active session; lazy-created on the v2 engine. */
 const SESSION_REQUIRING_COMMANDS: ReadonlySet<BuiltinSlashCommandName> = new Set([
-  'add-dir',
   'auto',
   'btw',
   'compact',

apps/kimi-code/test/tui/kimi-tui-message-flow.test.ts

@@ -762,6 +762,39 @@ describe('KimiTUI message flow', () => {
     expect(driver.state.appState.sessionId).toBe('');
   });
 
+  it('lists additional directories without creating a session (v2 engine)', async () => {
+    const session = makeSession({ id: 'ses-lazy' });
+    const startupInput: KimiTUIStartupInput = {
+      ...makeStartupInput(),
+      engineV2: true,
+      // No model configured: the read-only form must still work.
+      cliOptions: { ...makeStartupInput().cliOptions },
+    };
+    const { driver, harness } = await makeDriver(session, {}, startupInput);
+
+    driver.handleUserInput('/add-dir list');
+
+    expect(harness.createSession).not.toHaveBeenCalled();
+    expect(driver.state.appState.sessionId).toBe('');
+  });
+
+  it('lazily creates the session when adding a directory (v2 engine)', async () => {
+    const session = makeSession({ id: 'ses-lazy' });
+    const startupInput: KimiTUIStartupInput = {
+      ...makeStartupInput(),
+      engineV2: true,
+      cliOptions: { ...makeStartupInput().cliOptions, model: 'k2' },
+    };
+    const { driver, harness } = await makeDriver(session, {}, startupInput);
+
+    driver.handleUserInput('/add-dir /tmp/extra');
+
+    await vi.waitFor(() => {
+      expect(driver.getCurrentSessionId()).toBe('ses-lazy');
+    });
+    expect(harness.createSession).toHaveBeenCalledTimes(1);
+  });
+
   it('tracks /clear as the clear alias for /new', async () => {
     const { driver, harness } = await makeDriver(makeSession({ id: 'ses-1' }));
     const nextSession = makeSession({ id: 'ses-2' });