feat(quickadapter): log new label_weighting fill_* tunables

feat(quickadapter): log new label_weighting fill_* tunables

Mirror the existing softmax_temperature conditional-logging pattern:
always log fill_method, then log fill_epsilon and fill_epsilon_baseline
only under fill_method == "epsilon", and fill_sigma_candles only under
fill_method == "gaussian". Keeps the per-column "Weighting:" log block
consistent with the resolved config and avoids printing tunables that
have no effect under the active mode.