EMS-b: the remaining paint seams (empty families, registries, engine paint roots, paint-vectors step); behaviour-preserving

[thejackshelton]

EMS-b (T071, part 2 of 2): the remaining paint seams, stacked on EMS-a (#57). See notes/T046-paint-spec.md §3 and notes/T071-ems.md. Nothing changes behaviour: every seam is empty until PNT1, PNT2, BG2 and P6a fill it.

What changed

• Empty paint families in css/properties: radius, shadow, effects, outline, transform, background-layers and scrollbar. They are spread last into every aggregate. Outline and radius get shorthand stubs.
• Registries:
  • a paint-values registry, run once after computeLengths;
  • a paint-samples registry. Its modules may add points after the base points, or suppress base points. All of them are stubs for now.
• Sample-rule kinds: shadow and gradient. Their channel deltas come from allowances/shadow.ts and allowances/gradient.ts, and both equal GATE_CHANNEL_DELTA.
• Engine roots: engine paint.ts (BoxShape) and six empty paint-<feature>.ts roots. They are translated through generate.ts PAINT_ROOT_FILES, and the harness routes paint:<feature>:<fn> through units mode.
• Paint vectors: pnpm run layout:paint-vectors writes packages/layout/paint-vectors/<feature>/vectors.json (six empty suites).
  • It is a pnpm regen step.
  • .gitattributes and .macroscope/ignore.md list its output as generated (AGENTS.md step 3, and LAND-1: pnpm regen (cached, fixed-point regeneration chain) and a merge policy for generated outputs #58's policy test).
• Merge resolution: generate.ts takes master's rt roots and EMS-b's paint roots in one loop. The loop refuses a missing root file by name.
• Audit fix: layout:paint-vectors refuses a directory that no paint root names. A new paint-vectors-cli test failed before the fix.

Behaviour-preserving

• No capture, vector, profile or emitted file moves.
• The device run (pnpm run parity:devices) records every lane in master's state:
  • device-pixels fails on both targets, as on master;
  • every other lane passes, and lane parity passes;
  • out/device-failures-{ios,android}.json are byte-identical to master's.

What passed

• pnpm typecheck.
• pnpm test: 153 files; 3139 tests pass and 1 is skipped. The skipped test is the full pnpm regen --check, which runs only with DRAGON_REGEN_CHECK=1.
• pnpm regen reached a fixed point in 2 passes.

Changed tests

• samples.test.ts: SAMPLE_RULES gains shadow and gradient. The :n3 base-sample check excludes them, as it already excludes glyph, because no base point uses them.
• Pins: the dragon paint-seams and translate paint-roots tests gain their EMS-b pins.

No tolerance, check or test is loosened or removed. The reviewed diff is 83 KB in 75 files.

🤖 Generated with Claude Code

Note

Add empty paint seams, registries, and paint-vectors generation step (EMS-b)

• Adds empty seam modules for paint features: layout paint roots (paint.ts and six paint-<feature>.ts files), seven empty CSS property-family modules wired into properties.ts, and empty shorthand handler maps for outline and radius
• Adds ordered registries of stub modules: PAINT_SAMPLES in parity and PAINT_VALUES in dragon, all using shared no-op factories that keep base points and leave computed properties unchanged. computeLengths now calls computePaintValues after length resolution
• Adds the layout:paint-vectors CLI in paint-vectors.ts that generates committed per-feature vector fixtures (currently empty) from paint roots, wired into regen.ts
• Translation now treats paint roots as engine roots in generate.ts, and harnesses gained paintResult routing (regenerated Swift/Kotlin outputs updated accordingly)
• Extensive test coverage added across dragon, parity, layout, and translate packages for registry ordering, base-point preservation, tolerance handling, and vector validation
• Behavioral Change: pixel comparison in native-compare.ts now selects per-rule channel tolerance via CHANNEL_DELTA_BY_KIND (shadow/gradient currently equal the gate delta), and caseSamples routes through withPaintSamples

^{Macroscope summarized 6ca5e59.}

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This is a broad cross-package paint-seam and tooling change with new registry hooks, parity sampling paths, translation roots, and regenerated outputs. It also modifies .macroscope/ignore.md, a Macroscope configuration file that requires human review.

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