* test(core): move the fig round-trip suite into the package test home
The reader change added `verifier-contracts.test.ts` under
`tests/engine` and grew the migration baseline to admit it, which the
testing architecture forbids: new tests go to the canonical home and
the baseline only shrinks. It also started
`packages/core/tests/io/formats/fig/roundtrip/`, leaving two homes for
one domain.
These tests drive Core's exporter, so Core's home is the canonical one.
The directory moves whole — eleven files, its helpers and raw verifiers
with it — and picks up the local `assert`, `traversal`, `test-utils`
and fixture helpers already there. The baseline loses nine entries.
* refactor(core): address test helpers by alias instead of drilling
`open-pencil/no-deep-parent-relative-imports` already forbids `../../`
drilling, but `lint:structure` names the directories it checks and
`packages/{core,scene-graph,vue}/tests` were never added — so the 72
drilled imports in Core's tests, including the ones the round-trip move
just wrote, were never seen.
Core gains `#core-tests/*` beside fig's `#fig-tests/*`, registered with
the architecture rules, and its tests reach their helpers through it
and their source through `#core/*`. The three test directories join
`lint:structure`, which also surfaced six errors they had never been
checked for: four duplicated imports, an empty `noop`, and a
self-assignment the test meant, now written through a named binding.
Both guides state the rule, since a lint nobody can find in prose is
how this went unnoticed.
* fix(tools): point the heavy unit patterns at the relocated round-trip tests
`HEAVY_UNIT_TEST_PATTERNS` still listed the three heavy round-trip
tests under `tests/engine`. `test:unit` discovers them by directory so
the move looked clean, but `--heavy-only` selects by path and silently
stopped choosing them: 8 files, 52 tests, where it now runs 11 and 80.
* build(core): import Markdown with unplugin-raw
Core inlined ?raw imports with a hand-written Rolldown plugin that also turned plain .md imports into strings, which nothing in Core uses. unplugin-raw already does this for the Vue SDK and design-jsx; use it here too and drop the unused *.md module declaration.
* refactor(pen): use the scene-graph color parser
pen/src/color.ts duplicated parseColor from @open-pencil/scene-graph/color line for line. Import it instead, which also drops pen's direct culori dependency.
* fix(figma-api): validate effects like Figma
The effects setter stored whatever a script passed, so scripts that Figma rejects ran here and malformed effects reached rendering and .fig export. Validate against Figma's effect shapes with Valibot, recorded from live Figma: strict objects, required shadow fields, radius >= 0, RGBA channels within 0..1, and no shadow fields on blurs. The getter now returns Figma's shape so node.effects = node.effects keeps working.
Closes#786
* fix(figma-api): reject infinite numbers in effects
Figma rejects Infinity in every effect number ("Number must be finite"), but v.number() accepts it, so infinite radii, offsets, and spreads reached the scene graph.
* fix(figma-api): store PASS_THROUGH shadow blend as NORMAL
PASS_THROUGH is a layer blend mode. Live Figma accepts it on drop and inner shadows but reads NORMAL back, so do the same instead of storing it.
