feat(driver): add Android UiAutomator2 driver

Register `SUPPORTED_DRIVER_TYPES["uiautomator2"]` backed by the new
`AndroidDriver`, mirroring `WDADriver` method-for-method. tap/swipe/home use
the confirmed UiAutomator2 mobile commands (`clickGesture`, `dragGesture`,
`pressKey`); swipe converts `duration_ms` to a drag speed with a zero-distance
guard. Adds 34 mocked unit tests, an env-var-gated integration test, and
corrects the outdated "Android not registered" note in the iPhone setup doc.

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

driver/registry.py

@@ -5,6 +5,7 @@ from dataclasses import fields
 from typing import Any
 
 from device.manager import DriverFactory
+from driver.android_driver import AndroidDriver, AndroidDriverConfig
 from driver.wda_driver import WDADriver, WDADriverConfig
 
 DriverFactoryBuilder = Callable[[dict[str, Any]], DriverFactory]
@@ -29,8 +30,28 @@ def build_wda_driver_factory(connection_info: dict[str, Any]) -> DriverFactory:
     return lambda: WDADriver(config)
 
 
+def build_android_driver_factory(connection_info: dict[str, Any]) -> DriverFactory:
+    config_fields = {field.name for field in fields(AndroidDriverConfig)}
+    data = dict(connection_info)
+    raw_extra_capabilities = data.pop("extra_capabilities", {})
+    if not isinstance(raw_extra_capabilities, dict):
+        raise ValueError("extra_capabilities must be an object")
+
+    config_values: dict[str, Any] = {}
+    for key in list(data):
+        if key in config_fields and key != "extra_capabilities":
+            config_values[key] = data.pop(key)
+
+    config = AndroidDriverConfig(
+        **config_values,
+        extra_capabilities={**raw_extra_capabilities, **data},
+    )
+    return lambda: AndroidDriver(config)
+
+
 SUPPORTED_DRIVER_TYPES: dict[str, DriverFactoryBuilder] = {
     "wda": build_wda_driver_factory,
+    "uiautomator2": build_android_driver_factory,
 }