Set the fan speed

Set the fan speed — execute an absolute level verbatim, treat "up/down by N" and vague single-step phrasings ("turn it up a bit", "a notch stronger") as relative (read the current fan speed ONCE, then issue a SINGLE set at current±N, defaulting the unspecified step to one level; never step per turn, never overshoot, hold the computed value against vague corrections); for a bare "turn the fan on" with no level, resolve the level from the stored climate preference rather than defaulting to a guessed level; never re-ask what context already pins; and when the fan-speed tool or its level parameter is missing, or the current fan speed reads "unknown", do the doable part and ad…