* feat(scene-graph)!: make a stroke a paint
Stroke extends Fill, so a stroke carries the same paint vocabulary a
fill does instead of a lone color. Every construction site now states
a solid paint type, which keeps today's behaviour exactly; rendering,
.fig conversion, and the stroke panel still read solid strokes only.
copyFill is generic over the paint shape so copyStroke reuses it
rather than repeating the deep copy of gradient stops, transforms and
pattern fields.
Groundwork for the gradient and image strokes in #797.
* test(scene-graph): cover a stroke's nested paint data in copyStroke
A stroke is a paint now, so its gradient stops and transform must copy
as deeply as a fill's; the fixture was solid and proved only the color
and dash pattern.
* 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.
The 54 editor engine tests move to packages/core/tests/editor with their helpers, importing Core's public subpaths or source modules relatively. The package gains test and typecheck scripts; the first type check fixed nullable lookups, stale imports, and renderer doubles, and graph events now declare the GraphEventRenderer surface they invalidate. The engine baseline drops to 534 files.
