DX-1211: fix presence hint capability; move presence/subscribe errors off colliding 93002

Two fixes to the presence.get()/channel.subscribe() missing-mode errors:

- Hint correctness (review feedback): the presence hint named a
  "presence-subscribe" capability that does not exist. Presence delivery is
  governed by the "subscribe" capability, matching the subscribe-mode hint.

- Error-code collision: 93002 is the canonical server code for "namespace
  needs Mutable Messages" (ably-common errors.json, faqs.ably.com/error-code-93002).
  presence.get() reused it client-side. Move presence to 91008 (presence
  block, next to 91005) and channel.subscribe() to 90009 (channel block);
  93xxx is the annotations/mutable-messages block. Both codes are new on this
  unreleased branch, so the renumber is non-breaking. Reserved in
  ably/ably-common#345. Update the two tests asserting them.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: umair-ably

src/common/lib/client/realtimechannel.ts

@@ -520,7 +520,7 @@ class RealtimeChannel extends EventEmitter {
       const err = new ErrorInfo({
         message:
           'The channel was attached without the subscribe mode, so the server will not deliver messages to this listener.',
-        code: 93003,
+        code: 90009,
         statusCode: 400,
         hint: 'Include "subscribe" in the channel modes: realtime.channels.get(name, { modes: ["subscribe", ...] }), or call channel.setOptions({ modes: [...] }) on an existing channel (this triggers a reattach). Alternatively, omit modes entirely and ensure your token/API-key capability permits subscribe on this channel. If you have the Ably CLI installed, `ably auth keys list` shows your key\'s capabilities.',
       });

src/common/lib/client/realtimepresence.ts

@@ -251,9 +251,9 @@ class RealtimePresence extends EventEmitter {
       const err = new ErrorInfo({
         message:
           'The channel was attached without the presence_subscribe mode, so the server has not delivered any members to this client.',
-        code: 93002,
+        code: 91008,
         statusCode: 400,
-        hint: 'Include "presence_subscribe" in the channel modes: realtime.channels.get(name, { modes: ["presence_subscribe", ...] }), or call channel.setOptions({ modes: [...] }) on an existing channel (this triggers a reattach). Alternatively, omit modes entirely and ensure your token/API-key capability permits presence-subscribe on this channel. If you have the Ably CLI installed, `ably auth keys list` shows your key\'s capabilities.',
+        hint: 'Include "presence_subscribe" in the channel modes: realtime.channels.get(name, { modes: ["presence_subscribe", ...] }), or call channel.setOptions({ modes: [...] }) on an existing channel (this triggers a reattach). Alternatively, omit modes entirely and ensure your token/API-key capability permits subscribe on this channel. If you have the Ably CLI installed, `ably auth keys list` shows your key\'s capabilities.',
       });
       if (this.channel.client.options.strictMode === true) throw err;
       Logger.logActionNoStrip(

test/realtime/channel.test.js

@@ -2118,7 +2118,7 @@ define(['ably', 'shared_helper', 'async', 'chai'], function (Ably, Helper, async
     });
 
     describe('subscribe() without subscribe mode', function () {
-      it('with strictMode:true, attach resolves but subscribe rejects with 93003 and a subscribe-mode hint', async function () {
+      it('with strictMode:true, attach resolves but subscribe rejects with 90009 and a subscribe-mode hint', async function () {
         const helper = this.test.helper;
         const realtime = helper.AblyRealtime({ strictMode: true });
         await helper.monitorConnectionThenCloseAndFinishAsync(async () => {
@@ -2132,7 +2132,7 @@ define(['ably', 'shared_helper', 'async', 'chai'], function (Ably, Helper, async
             caught = err;
           }
           expect(caught, 'expected channel.subscribe() to reject').to.exist;
-          expect(caught.code).to.equal(93003);
+          expect(caught.code).to.equal(90009);
           expect(caught.hint).to.be.a('string');
           expect(caught.hint).to.contain('subscribe');
           expect(caught.hint).to.contain('ably auth keys list');

test/realtime/presence.test.js

@@ -2501,7 +2501,7 @@ define(['ably', 'shared_helper', 'async', 'chai'], function (Ably, Helper, async
     });
 
     describe('presence.get() without presence_subscribe mode', function () {
-      it('with strictMode:true, rejects with 93002 and hint naming presence_subscribe', function (done) {
+      it('with strictMode:true, rejects with 91008 and hint naming presence_subscribe', function (done) {
         const helper = this.test.helper;
         const channelName = 'presence-get-without-mode-strict-' + String(Math.random()).slice(2);
         let realtime;
@@ -2517,7 +2517,7 @@ define(['ably', 'shared_helper', 'async', 'chai'], function (Ably, Helper, async
               Helper.whenPromiseSettles(channel.presence.get(), function (err) {
                 try {
                   expect(err, 'expected presence.get() to reject').to.exist;
-                  expect(err.code).to.equal(93002);
+                  expect(err.code).to.equal(91008);
                   expect(err.hint).to.be.a('string');
                   expect(err.hint).to.contain('presence_subscribe');
                   expect(err.hint).to.contain('ably auth keys list');