feat(discord): make the typed first-message hint a separate opt-in, off by default

Claude keeps the silent system-prompt hint (startupHint, on). Other CLIs are sent the typed message only with typedHint, which costs a model turn per tab.

test/discord-bridge.test.ts

@@ -3,7 +3,16 @@
  * @fileoverview Discord bridge: pure rules, the 0600 store, the REST client, the gateway state
  * machine (fake socket) and the bridge's gates. No network, no real Discord.
  */
-import { existsSync, mkdirSync, mkdtempSync, readFileSync, rmSync, statSync, symlinkSync, writeFileSync } from 'node:fs';
+import {
+  existsSync,
+  mkdirSync,
+  mkdtempSync,
+  readFileSync,
+  rmSync,
+  statSync,
+  symlinkSync,
+  writeFileSync,
+} from 'node:fs';
 import { tmpdir } from 'node:os';
 import { join } from 'node:path';
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
@@ -634,7 +643,7 @@ describe('DiscordBridge files and startup hint', () => {
       now: () => t,
       sleep: async () => undefined,
     });
-    return writeDiscordConfig(dir, { ...CFG, ...cfg }).then(async () => {
+    return writeDiscordConfig(dir, { ...CFG, typedHint: true, ...cfg }).then(async () => {
       await b.reload();
       await b.notify(MSG);
       posted.length = 0;
@@ -730,6 +739,15 @@ describe('DiscordBridge files and startup hint', () => {
     b.stop();
   });
 
+  it('sends the typed hint only when typedHint is on (the default is off)', async () => {
+    const off = await make({ typedHint: false });
+    await off.sessionCreated('s7', 'new', t - 1000);
+    await off.sessionIdle('s7', true);
+    expect(sent).toHaveLength(0);
+    off.stop();
+    expect(DEFAULT_DISCORD_CONFIG.typedHint).toBe(false);
+  });
+
   it('does not hint a restored (old) session, or when startupHint is off', async () => {
     const b = await make();
     await b.sessionCreated('s4', 'old', 1); // created long ago: restored at server start

test/routes/discord-routes.test.ts

@@ -79,6 +79,19 @@ describe('/api/discord', () => {
     bridge.stop();
   });
 
+  it('stores startupHint (default on) and typedHint (default off) and returns them', async () => {
+    const { app, bridge } = await harness();
+    const first = (await app.inject({ method: 'GET', url: '/api/discord' })).json().data;
+    expect(first).toMatchObject({ startupHint: true, typedHint: false });
+    const put = await app.inject({
+      method: 'PUT',
+      url: '/api/discord',
+      payload: { typedHint: true, startupHint: false },
+    });
+    expect(put.json().data).toMatchObject({ startupHint: false, typedHint: true });
+    bridge.stop();
+  });
+
   it('refuses a bad id, an incomplete enable, and unknown fields', async () => {
     const { app } = await harness();
     const bad = await app.inject({ method: 'PUT', url: '/api/discord', payload: { guildId: 'not-a-number' } });