Add aggressiveness-scaled brake ramping

[JohanAlvedal]

Motivation

• Implement directional, aggressiveness-scaled ramping for the winter brake_offset_c so the brake offset approaches the target at a controllable speed instead of using a symmetric rate limiter.

Description

• Compute ramp_factor by clamping aggressiveness to 1..5 and dividing by 3.0, then derive ramp_up_c_per_15min = 3.0 * ramp_factor and ramp_down_c_per_15min = 2.0 * ramp_factor.
• Scale ramp steps by the update interval with step_up = ramp_up_c_per_15min * (dt_minutes / 15.0) and step_down = ramp_down_c_per_15min * (dt_minutes / 15.0) and apply directional logic so the offset increases by step_up or decreases by step_down toward the target.
• Replace the previous symmetric apply_rate_limit usage for brake offset with the new separate up/down ramp logic and continue to persist the offset using the existing _persist_brake_offset flow.
• Expose the computed ramp_up_c_per_15min and ramp_down_c_per_15min in the sensor attributes via _build_attributes.

Testing

• Ran the test suite with pytest -q and all tests passed: 31 passed.

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