v0.4.2

Fixed

• Cushion shading applied to directory tiles — the batch cushion pass
  incorrectly treated directory rectangles as file tiles, applying full-strength
  shading to the entire area of each directory. Directories are now shaded at half
  strength (scale 0.5) to give broad structural context, while individual file leaf
  tiles continue to receive full-strength shading. The effect is two-level: directory
  gradients provide coarse orientation, per-file gradients add local detail — matching
  the hierarchical intent of van Wijk (1999). Both the PNG and SVG renderers are updated.

Added

• dirplot overview command — prints a human-readable summary of all
  commands, their arguments, options, and global options. Appears at position
  #2 in the help listing.

• dirplot hg command — replay Mercurial changeset history as an animated
  treemap, identical in interface to dirplot git. Supports --animate,
  --max-commits, --last, --total-duration, --frame-duration, --fade-out,
  --dark/--light, --workers, --crf, --codec, and all other animation flags.
  The @rev suffix on the repo path passes a revset directly to hg log.
  Requires hg on PATH. Only local repositories are supported — there is no
  hg:// URI scheme because there is no Mercurial equivalent of GitHub.

  dirplot hg /path/to/repo --output history.png --animate
  dirplot hg /path/to/repo@tip --output history.png
  dirplot hg /path/to/repo --animate --last 30d --output history.mp4