feat: Matrix connector core — rooms, messaging, sync

- rooms: create, join, leave, forget, list, resolve alias, get info/members,
  invite/kick/ban/unban, set name/topic. RoomInfo/MemberInfo/PowerLevels dataclasses.
- messaging: send text (with HTML, reply, thread), notice, emote, image, file,
  sticker, edit, redact, react, typing, read receipts, fully-read markers.
- sync: SyncEngine with event-type/room/global handler dispatch,
  incremental sync with backoff retry, SyncFilter, paginated message history.
- CLI: rooms (list/create/join/leave/info/members/invite), send (text/image/file),
  sync (listen with filters).
- 182 tests pass (60 existing + 122 new).

tests/test_cli.py

@@ -203,3 +203,100 @@ class TestCmdLogout:
             args = build_parser().parse_args(["logout"])
             result = cmd_logout(args)
             assert result == 0
+
+
+# ---------------------------------------------------------------------------
+# New async command parser tests
+# ---------------------------------------------------------------------------
+
+
+class TestNewCommandsParser:
+    """Tests for parser entries of rooms, send, sync commands."""
+
+    def test_rooms_subparser_exists(self):
+        parser = build_parser()
+        choices = parser._subparsers._group_actions[0].choices
+        assert "rooms" in choices
+        assert "send" in choices
+        assert "sync" in choices
+
+    def test_rooms_list(self):
+        args = build_parser().parse_args(["rooms", "list"])
+        assert args.command == "rooms"
+        assert args.rooms_action == "list"
+
+    def test_rooms_create(self):
+        args = build_parser().parse_args(
+            ["rooms", "create", "--name", "Test", "--topic", "Hello", "--public"]
+        )
+        assert args.rooms_action == "create"
+        assert args.name == "Test"
+        assert args.topic == "Hello"
+        assert args.public is True
+
+    def test_rooms_join(self):
+        args = build_parser().parse_args(["rooms", "join", "!room:example.org"])
+        assert args.rooms_action == "join"
+        assert args.room == "!room:example.org"
+
+    def test_rooms_leave(self):
+        args = build_parser().parse_args(["rooms", "leave", "!room:example.org"])
+        assert args.rooms_action == "leave"
+        assert args.room == "!room:example.org"
+
+    def test_rooms_info(self):
+        args = build_parser().parse_args(["rooms", "info", "!room:example.org"])
+        assert args.rooms_action == "info"
+        assert args.room == "!room:example.org"
+
+    def test_rooms_members(self):
+        args = build_parser().parse_args(["rooms", "members", "!room:example.org"])
+        assert args.rooms_action == "members"
+
+    def test_rooms_invite(self):
+        args = build_parser().parse_args(
+            ["rooms", "invite", "!room:example.org", "@alice:example.org"]
+        )
+        assert args.rooms_action == "invite"
+        assert args.user == "@alice:example.org"
+
+    def test_send_text(self):
+        args = build_parser().parse_args(["send", "text", "!room:example.org", "Hello world"])
+        assert args.send_action == "text"
+        assert args.room == "!room:example.org"
+        assert args.body == "Hello world"
+
+    def test_send_text_with_reply(self):
+        args = build_parser().parse_args(
+            ["send", "text", "!room:example.org", "Replying", "--reply-to", "$evt:example.org"]
+        )
+        assert args.reply_to == "$evt:example.org"
+
+    def test_send_image(self):
+        args = build_parser().parse_args(
+            ["send", "image", "!room:example.org", "/tmp/photo.jpg", "--caption", "My photo"]
+        )
+        assert args.send_action == "image"
+        assert args.path == "/tmp/photo.jpg"
+        assert args.caption == "My photo"
+
+    def test_send_file(self):
+        args = build_parser().parse_args(
+            ["send", "file", "!room:example.org", "/tmp/doc.pdf"]
+        )
+        assert args.send_action == "file"
+
+    def test_sync_listen(self):
+        args = build_parser().parse_args(["sync", "listen"])
+        assert args.sync_action == "listen"
+        assert args.filter_type == []
+        assert args.room == []
+        assert args.show_all is False
+
+    def test_sync_listen_with_filters(self):
+        args = build_parser().parse_args(
+            ["sync", "listen", "--filter-type", "m.room.message", "--room", "!test:example.org", "--show-all"]
+        )
+        assert args.filter_type == ["m.room.message"]
+        assert args.room == ["!test:example.org"]
+        assert args.show_all is True