Scripted demo-stand vacuum: the checklist needs a robot no hardware can provide

The public stand cannot run any Tier-A map integration (no radios, no
robots), which left the whole vacuum section of docs/TESTING.md untestable
outside the owner's home. demo_robot fakes exactly the surface the card
consumes: a Tasshack-shaped map sensor (dict vacuum_position, rooms named
after the plan rooms so auto-calibration has something to match, flipped Y
so the mirror default is meaningful) and a vacuum that drives a serpentine
route through every room in ~3.5 minutes and docks itself.

demo/stand/demo_robot/sensor.py

@@ -0,0 +1,56 @@
+"""The map sensor of the stand simulator — Tasshack-shaped attributes.
+
+`vacuum_position` is a plain dict on purpose: the real Tasshack integration
+keeps a Point OBJECT in memory (houseplan's trail recorder handles both), but
+a dict is what any template/attribute tooling on the stand can also read.
+"""
+from __future__ import annotations
+
+from typing import Any
+
+from homeassistant.components.sensor import SensorEntity
+from homeassistant.core import HomeAssistant
+
+from . import DOMAIN, ROOMS, RobotSim
+
+
+async def async_setup_platform(hass: HomeAssistant, config, add_entities, discovery_info=None) -> None:
+    add_entities([DemoRobotMap(hass.data[DOMAIN])])
+
+
+class DemoRobotMap(SensorEntity):
+    _attr_should_poll = False
+    _attr_name = "Карта робота-пылесоса"
+    _attr_unique_id = "demo_robot_map"
+    _attr_icon = "mdi:map"
+
+    def __init__(self, sim: RobotSim) -> None:
+        self._sim = sim
+        self.entity_id = "sensor.demo_robot_map"
+
+    async def async_added_to_hass(self) -> None:
+        self.async_on_remove(self._sim.add_listener(self.async_write_ha_state))
+
+    @property
+    def native_value(self) -> str:
+        return self._sim.state
+
+    @property
+    def extra_state_attributes(self) -> dict[str, Any]:
+        x, y = self._sim.pos
+        return {
+            "vacuum_position": {
+                "x": round(x, 1),
+                "y": round(y, 1),
+                "a": round(self._sim.heading, 1),
+            },
+            "rooms": {
+                rid: {
+                    "name": name,
+                    "x0": x0, "y0": y0, "x1": x1, "y1": y1,
+                    "x": (x0 + x1) / 2, "y": (y0 + y1) / 2,
+                }
+                for rid, (name, x0, y0, x1, y1) in ROOMS.items()
+            },
+            "map_index": 1,
+        }