gigapdf-lib v0.72.0

Fidelity release focused on text extraction and AcroForm rendering on dense
government forms (CERFA). The public API is additive — existing behaviour is
unchanged except where noted as a fix.

Added

• FormField now surfaces its text-formatting metadata. Each field exposes
  comb (the /Ff comb flag for fixed-pitch character cells), quadding (the
  /Q justification: 0 left, 1 centre, 2 right), and the default-appearance font
  and size parsed from the field's /DA string as daFont / daSize. This lets
  a host reproduce a field's intended layout (combed cells, alignment, font
  metrics) without re-parsing the appearance stream.

Fixed

• Spurious in-word spaces during text extraction. A new gap-aware
  runs_join helper now drives all four reconstruction paths (lines,
  paragraphs, lists, tables): a word split across several font runs no longer
  emits a phantom space at each run boundary (e.g. ENFANT S is reassembled as
  ENFANTS). Spacing is decided from the real inter-run gap, not the mere fact
  that the text changed font.
• Form-field appearances double-rendered behind the editable text. A
  widget_appearances flag makes renderPageNoText / renderPageExcluding
  omit the /AP appearance streams of AcroForm widgets, so a filled field's
  baked-in value no longer shows through underneath the live, editable overlay.
• Borderless prose misdetected as a table. A line_has_gutter guard now
  requires a real inter-cell gutter before promoting a borderless block to a
  table: a two-run-per-line prose notice is kept as prose, while genuine tables
  (wide column gutters) are still recognised.