`--depth-{plane}-scrim` was declared (DepthPlane field, DEPTH_CUES, validation,
applyDepth) but never seeded, emitted or read — a write-surface with no reader
(applyDepth({p:{scrim}}) silently no-op'd; never present in generated base.css).
Analyzed via workflow (state map + 4 dispositions + adversarial stress). The
four collapse to prune vs promote-to-z-parity: wire-and-unify SINKS (contradicts
the test-locked z open-cage precedent + the MD3/Radix/Vaul consensus that the
veil is component-owned, not an elevation cue), relocate flips its verb to
retain, and complete-to-z-parity would mint a third alias of the --color-overlay
backdrop role. Unlike z (kept as an exposed open cage — it varies per plane and
is unpaintable-forever), scrim has no per-plane variance and no value to seed.
Prune: remove scrim from DepthPlane / DEPTH_CUES / validation / emitter +
applyDepth doc. Amend rfc-depth.md (token contract + Phase-4 note + atmosphere
rows), reference.md cue list, changelog, pendiente. The modal veil stays where
MD3/Radix/Vaul + the standing decision put it: --{component}-overlay-* tinted by
--color-overlay.
Zero observable change (never emitted). Tests 71/71; npm run check src/ = 9
baseline, 0 new; base.css unchanged.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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