feat: /notify command for runtime notification filter control (#161)

Add /notify Telegram command for adjusting notification filters at runtime
without restarting the service:

  /notify                  → show current filter state
  /notify scenario off     → disable scenario match alerts
  /notify market off       → disable market open/close alerts
  /notify all off          → disable all (circuit_breaker always on)
  /notify trades on        → re-enable trade execution alerts

Changes:
- NotificationFilter: add KEYS class var, set_flag(), as_dict()
- TelegramClient: add set_notification(), filter_status()
- TelegramCommandHandler: add register_command_with_args() + args dispatch
- main.py: handle_notify() handler + register /notify command + /help update
- Tests: 12 new tests (set_flag, set_notification, register_command_with_args)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_telegram.py

@@ -605,3 +605,63 @@ class TestNotificationFilter:
             await client.notify_system_start("paper", ["KR"])
             await client.notify_system_shutdown("Normal shutdown")
             mock_post.assert_not_called()
+
+    def test_set_flag_valid_key(self) -> None:
+        """set_flag returns True and updates field for a known key."""
+        nf = NotificationFilter()
+        assert nf.set_flag("scenario", False) is True
+        assert nf.scenario_match is False
+
+    def test_set_flag_invalid_key(self) -> None:
+        """set_flag returns False for an unknown key."""
+        nf = NotificationFilter()
+        assert nf.set_flag("unknown_key", False) is False
+
+    def test_as_dict_keys_match_KEYS(self) -> None:
+        """as_dict() returns every key defined in KEYS."""
+        nf = NotificationFilter()
+        d = nf.as_dict()
+        assert set(d.keys()) == set(NotificationFilter.KEYS.keys())
+
+    def test_set_notification_valid_key(self) -> None:
+        """TelegramClient.set_notification toggles filter at runtime."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        assert client._filter.scenario_match is True
+        assert client.set_notification("scenario", False) is True
+        assert client._filter.scenario_match is False
+
+    def test_set_notification_all_off(self) -> None:
+        """set_notification('all', False) disables every filter flag."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        assert client.set_notification("all", False) is True
+        for v in client.filter_status().values():
+            assert v is False
+
+    def test_set_notification_all_on(self) -> None:
+        """set_notification('all', True) enables every filter flag."""
+        client = TelegramClient(
+            bot_token="123:abc", chat_id="456", enabled=True,
+            notification_filter=NotificationFilter(
+                trades=False, market_open_close=False, scenario_match=False,
+                fat_finger=False, system_events=False, playbook=False, errors=False,
+            ),
+        )
+        assert client.set_notification("all", True) is True
+        for v in client.filter_status().values():
+            assert v is True
+
+    def test_set_notification_unknown_key(self) -> None:
+        """set_notification returns False for an unknown key."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        assert client.set_notification("unknown", False) is False
+
+    def test_filter_status_reflects_current_state(self) -> None:
+        """filter_status() matches the current NotificationFilter state."""
+        nf = NotificationFilter(trades=False, scenario_match=False)
+        client = TelegramClient(
+            bot_token="123:abc", chat_id="456", enabled=True, notification_filter=nf
+        )
+        status = client.filter_status()
+        assert status["trades"] is False
+        assert status["scenario"] is False
+        assert status["market"] is True

tests/test_telegram_commands.py

@@ -875,3 +875,91 @@ class TestGetUpdates:
             updates = await handler._get_updates()
 
             assert updates == []
+
+
+class TestCommandWithArgs:
+    """Test register_command_with_args and argument dispatch."""
+
+    def test_register_command_with_args_stored(self) -> None:
+        """register_command_with_args stores handler in _commands_with_args."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        handler = TelegramCommandHandler(client)
+
+        async def my_handler(args: list[str]) -> None:
+            pass
+
+        handler.register_command_with_args("notify", my_handler)
+        assert "notify" in handler._commands_with_args
+        assert handler._commands_with_args["notify"] is my_handler
+
+    @pytest.mark.asyncio
+    async def test_args_handler_receives_arguments(self) -> None:
+        """Args handler is called with the trailing tokens."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        handler = TelegramCommandHandler(client)
+
+        received: list[list[str]] = []
+
+        async def capture(args: list[str]) -> None:
+            received.append(args)
+
+        handler.register_command_with_args("notify", capture)
+
+        update = {
+            "message": {
+                "chat": {"id": "456"},
+                "text": "/notify scenario off",
+            }
+        }
+        await handler._handle_update(update)
+        assert received == [["scenario", "off"]]
+
+    @pytest.mark.asyncio
+    async def test_args_handler_takes_priority_over_no_args_handler(self) -> None:
+        """When both handlers exist for same command, args handler wins."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        handler = TelegramCommandHandler(client)
+
+        no_args_called = []
+        args_called = []
+
+        async def no_args_handler() -> None:
+            no_args_called.append(True)
+
+        async def args_handler(args: list[str]) -> None:
+            args_called.append(args)
+
+        handler.register_command("notify", no_args_handler)
+        handler.register_command_with_args("notify", args_handler)
+
+        update = {
+            "message": {
+                "chat": {"id": "456"},
+                "text": "/notify all off",
+            }
+        }
+        await handler._handle_update(update)
+        assert args_called == [["all", "off"]]
+        assert no_args_called == []
+
+    @pytest.mark.asyncio
+    async def test_args_handler_with_no_trailing_args(self) -> None:
+        """/notify with no args still dispatches to args handler with empty list."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        handler = TelegramCommandHandler(client)
+
+        received: list[list[str]] = []
+
+        async def capture(args: list[str]) -> None:
+            received.append(args)
+
+        handler.register_command_with_args("notify", capture)
+
+        update = {
+            "message": {
+                "chat": {"id": "456"},
+                "text": "/notify",
+            }
+        }
+        await handler._handle_update(update)
+        assert received == [[]]