Remove unnecessary startup deferral in sensor async_added_to_hass

[Copilot]

The initial entity update in async_added_to_hass was deferred until EVENT_HOMEASSISTANT_STARTED when HA wasn't fully running. The deferral is unnecessary — async_update is fast (date arithmetic + todo list sync) and doesn't block startup. The deferred path also used asyncio.run_coroutine_threadsafe, which is designed for cross-thread scheduling and is incorrect when called from within the event loop.

Changes

• sensor.py: Replace the CoreState.running conditional and async_listen_once/run_coroutine_threadsafe deferral with a direct await self.async_update() call. Remove now-unused imports: asyncio, CoreState, EVENT_HOMEASSISTANT_STARTED.

Before:

if self.hass.state == CoreState.running:
    await self.async_update()
else:
    self.hass.bus.async_listen_once(
        EVENT_HOMEASSISTANT_STARTED,
        lambda _event: asyncio.run_coroutine_threadsafe(
            self.async_update_ha_state(force_refresh=True), self.hass.loop
        )
    )

After:

await self.async_update()

• test/test_sensor.py: Add TestTaskTrackerSensorAddedToHass covering: immediate update call, update called regardless of hass.state, state restoration, event listener registration, and absence of async_listen_once registration.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Sensor update deferral necessary?</issue_title>
<issue_description>In sensor.pys async_added_to_hass the entity update is deferred to after Home Assistant is fully started. Is this sensible or should the update be so fast that this is unnecessary even when a lot of tasks are configured?</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Sensor update deferral necessary? #16

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