A "Ready for X" gating step (fp.step.kind code='gating') maps to
area_kind='receiving' in the taxonomy. For a MID-recipe gate (e.g.
"Ready for processing" between Racking and Plating) that snapped the
job's card back to the far-left Receiving column when work advanced into
it — the job looked like it vanished from the board.
_compute_area_kind now detects gating via the stable kind code and
resolves a gating step's column to the NEXT non-gating step's area (so
"Ready for processing" shows in Plating), keeping cards flowing
left→right. Falls back to the last real stage for a trailing gate.
Non-gating steps unchanged. Helpers: _fp_is_gating_step / _fp_raw_area_kind
(no recursion) / _fp_resolve_area_kind.
area_kind is a stored compute — recomputed all 537 live steps on entech.
Verified: WO-30061 "Ready for processing" area receiving→plating, card now
renders in the Plating column.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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