Persist winter price brake offset and apply to control temperature

[JohanAlvedal]

Motivation

• Allow a real, persistent winter price braking offset to affect the computed control temperature so expensive prices actually raise the control signal.
• Compute brake targets from price pressure and apply them only when outdoor temperature is below WINTER_BRAKE_THRESHOLD using the existing WINTER_BRAKE_TEMP_OFFSET.
• Surface the braking internals as attributes so users can inspect brake_target_c, brake_offset_c, and control_outdoor_temperature at runtime.

Description

• Add a per-entry Store (_brake_offset_store) and persistence helpers async_load/async_save wrappers via _load_brake_offset and _persist_brake_offset to hold brake_offset_c across restarts.
• Compute price_pressure = clamp(price_factor_percent / 100, 0, 1) and brake_target_c = price_pressure * WINTER_BRAKE_TEMP_OFFSET (applied only when sensor_data["outdoor_temp"] <= WINTER_BRAKE_THRESHOLD), then rate-limit the applied brake_offset_c using the existing apply_rate_limit.
• Apply the offset to the temperature used for control as control_outdoor_temperature = fake_temp + brake_offset_c and clamp that final control temperature within MIN_FAKE_TEMP..MAX_FAKE_TEMP before passing it into _apply_control_bias.
• Ensure attributes brake_target_c, brake_offset_c, and control_outdoor_temperature are populated in the sensor attributes for visibility.
• Guard ML initialization for test environments and add a minimal Store stub in test helpers so unit tests can run without a full Home Assistant runtime.

Note: the implementation uses only the existing constants WINTER_BRAKE_TEMP_OFFSET, WINTER_BRAKE_THRESHOLD, MIN_FAKE_TEMP, and MAX_FAKE_TEMP as requested.

Testing

• Ran pytest against the repository test suite; final result: 31 passed.
• During development initial test collection failed due to missing homeassistant.helpers.storage in the test stubs, which was resolved by adding a minimal Store stub; after that all tests passed.

Explanation of the true control signal: the effective control value sent to the heat pump is the PI-adjusted temperature adjusted_temp which is assigned to the sensor via self._attr_native_value after control_outdoor_temperature (which includes brake_offset_c) is run through _apply_control_bias.

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