fix: add mypy overrides for IoT drivers with optional dependencies

IoT drivers (gpio, mqtt, serial) use optional third-party packages that
may not have stubs installed. Add per-module mypy overrides to:
- Suppress import-not-found/import-untyped for gpiozero, paho, serial
- Suppress warn_unused_ignores for driver module type:ignore comments
- Cover both return-value and no-any-return in driver return ignores

Tested: standard, iot, and full variants all pass ruff + mypy.

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

Author: namitdeb739-aug

template/pyproject.toml.jinja

@@ -113,6 +113,16 @@ strict = true
 warn_return_any = true
 warn_unused_configs = true
 mypy_path = "src"
+{%- if use_iot %}
+
+[[tool.mypy.overrides]]
+module = ["gpiozero", "paho", "paho.*", "serial"]
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "{{ package_name }}.drivers.*"
+warn_unused_ignores = false
+{%- endif %}
 {% endif %}
 
 [tool.pytest.ini_options]

template/src/project_name/drivers/gpio.py.jinja

@@ -38,9 +38,9 @@ def led(pin: int) -> DigitalOutput:
     Returns:
         A :class:`DigitalOutput` backed by :class:`~gpiozero.LED`.
     """
-    from gpiozero import LED  # type: ignore[import-untyped]
+    from gpiozero import LED
 
-    return LED(pin)  # type: ignore[return-value]
+    return LED(pin)  # type: ignore[return-value,no-any-return]
 
 
 def button(pin: int, pull_up: bool = True) -> DigitalInput:
@@ -53,6 +53,6 @@ def button(pin: int, pull_up: bool = True) -> DigitalInput:
     Returns:
         A :class:`DigitalInput` backed by :class:`~gpiozero.Button`.
     """
-    from gpiozero import Button  # type: ignore[import-untyped]
+    from gpiozero import Button
 
-    return Button(pin, pull_up=pull_up)  # type: ignore[return-value]
+    return Button(pin, pull_up=pull_up)  # type: ignore[return-value,no-any-return]

template/src/project_name/drivers/mqtt.py.jinja

@@ -39,6 +39,6 @@ def create_client(client_id: str = "") -> MQTTClient:
         client.loop_start()
         client.publish("{{ project_name }}/telemetry", '{"temp": 21.5}')
     """
-    import paho.mqtt.client as mqtt  # type: ignore[import-untyped]
+    import paho.mqtt.client as mqtt
 
-    return mqtt.Client(mqtt.CallbackAPIVersion.VERSION2, client_id=client_id)  # type: ignore[return-value]
+    return mqtt.Client(mqtt.CallbackAPIVersion.VERSION2, client_id=client_id)  # type: ignore[return-value,no-any-return]

template/src/project_name/drivers/serial.py.jinja

@@ -38,4 +38,4 @@ def open_serial(port: str, baudrate: int = 115200, timeout: float = 1.0) -> Seri
     """
     import serial  # pyserial — imported lazily so tests don't require hardware
 
-    return serial.Serial(port, baudrate=baudrate, timeout=timeout)  # type: ignore[return-value]
+    return serial.Serial(port, baudrate=baudrate, timeout=timeout)  # type: ignore[return-value,no-any-return]