Initial commit: esphome-xtool-ap2 ESPHome component

Control one or two xTool SafetyPro AP2 air purifiers over BLE and expose them to Home Assistant via an ESP32 (the ap2_hub external component): per-slot fan control with live gear sync, runtime-settable flash-persisted MACs, an on-device scanner, M9033 status polling (filter life, serial, firmware), buzzer control, and BLE bonding. Includes the PC debug tool (tools/ap2_ble.py) and the reverse-engineered protocol spec (SPEC.md).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

components/ap2_hub/fan.py

@@ -0,0 +1,27 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import fan
+
+from . import AP2Hub, ap2_hub_ns
+
+CONF_AP2_HUB_ID = "ap2_hub_id"
+CONF_SLOT = "slot"
+
+AP2Fan = ap2_hub_ns.class_("AP2Fan", fan.Fan, cg.Component)
+
+CONFIG_SCHEMA = fan.fan_schema(AP2Fan).extend(
+    {
+        cv.GenerateID(CONF_AP2_HUB_ID): cv.use_id(AP2Hub),
+        cv.Required(CONF_SLOT): cv.int_range(min=0, max=1),
+    }
+).extend(cv.COMPONENT_SCHEMA)
+
+
+async def to_code(config):
+    var = await fan.new_fan(config)
+    await cg.register_component(var, config)
+    parent = await cg.get_variable(config[CONF_AP2_HUB_ID])
+    cg.add(var.set_hub(parent))
+    cg.add(var.set_slot(config[CONF_SLOT]))
+    # Let the slot push live gear updates (from M9033) into this fan.
+    cg.add(parent.set_fan(config[CONF_SLOT], var))