v1.2.1

Changes since v1.2.0

New Features

• Hardware error recovery protocol: REQHWER/ACKHWER commands pause acquisition on hardware errors, show user dialog with error details and Retry/Skip/Cancel options
• Stage move retry: Automatic 2x retry with 2s delay on serial errors before pausing
• Gap-based autofocus: Force sweep drift check when tissue regions are separated by more than n_tiles positions

Improvements

• Sweep drift check parameters configurable from YAML (sweep_range_um, sweep_n_steps, score_metric)
• Default metric changed to normalized_variance (validated 145% signal at 20x)
• Legacy support for old adaptive_initial_step_um parameter
• Replaced 5 adaptive AF parameters with 2 sweep parameters

Bug Fixes

• Log splitting fix: same config reuses existing log file
• Time estimation: write actual AF position count instead of interval