fix(import): carry Figma strokes through real stroke channels instead of dropping them

[shipyard-local]

Item #2 of the Figma-import hardening plan. Stacked on #6416 (fill-rule) — its diff reduces to only the stroke changes once #6416 merges.

Strokes were the only material property the audit showed losing (96 across the 3 files). Ground truth differed from the plan in useful ways:

• Gradient rims (knob "Oval"/"knob base") — two gaps: the Oval rim had NO baked geometry (only an authored vector network), so it fell to a plain box. Added a vector-network decoder (paths.mjs, self-validated by exact byte consumption) + a full gradient-stroke channel (SvgPathWidget::set_stroke_gradient → Canvas::set_stroke_gradient_linear, setSvgStrokeGradient bridge + manifest + oracle, codegen, IR capture, native, decoder lowering). Caveat: all 20 rims are paint-opacity-0 (designer-disabled; Figma renders them invisible too) — verified by audit + Skia raster proof.
• Sequencer step cells (48 "findings") — were NEVER dropped; they render correctly. The findings were an audit blind-spot + a diagnostics-join bug (pushDiag logged the master guid, not the instance) — both fixed. The real drop was 1 fill+stroke node per FX file, now riding the same path (exact for CENTER align — no sibling vector needed).
• XY-pad triangle — Figma bakes INSIDE stroke bands unclipped (a 2px INSIDE stroke → 4px band that render-time clipping trims; we didn't clip), so it painted fat and bright. Decoder now prefers the fill outline + a centered stroke channel — the triangle renders as a thin dim line matching Figma (before/after crops).

Verification

• Decode-stage stroke counts fully close: A Channel FX 42/65 → 65/65, designers-pick 42/65 → 65/65, sequencer 33/83 → 83/83 (zero unaccounted). thumb_parity (1006,189) block clears in both FX files; sequencer unchanged; mixer reference 43/43 (only sub-pixel AA shifts).
• ctest svg|path|import|design|native|canvas all pass except the known pre-existing PulpSampler SEGFAULT. JS 136/136. New tests: gradient-stroke unit ×3 + Skia raster proof + bridge/IR round-trips + ellipse-synthesis e2e + vector-network/INSIDE-band/instance-diag scene tests.

🤖 Generated with Claude Code

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🔎 Provenance

Agent	codex
Machine	m3
Tab	design PRs
Directory	/Volumes/Workshop/Code/pulp
Session	019f8d7d-1d7b-7b00-b48a-e4c4213b1161

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_{stamped 2026-07-23 14:37 UTC}