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feat(color-handle): 2nd-gen migration (#6480)

* feat(color-handle): scaffold 2nd-gen core/SWC structure (Phase 2&3) (#6443)

* feat(color-handle): scaffold 2nd-gen core/SWC structure (Phase 2)

Set up the 2nd-gen file and folder structure for Color Handle, mirroring
the migrated color-loupe core/SWC split. Stub-only; implementation lands
in later phases.

Core (@spectrum-web-components/core):
- ColorHandle.base.ts: abstract ColorHandleBase with the 5-property
  contract (color, disabled, focused, open, fill) and pointer/touch
  open-close behavior ported from 1st-gen.
- ColorHandle.types.ts: ColorHandleProperties interface.
- index.ts re-export; explicit exports + typesVersions wired in
  package.json (badge pattern).

SWC (@adobe/spectrum-wc):
- ColorHandle.ts (swc-color-handle): stub render composing inner swatch
  over the shared opacity checkerboard plus a built-in swc-color-loupe.
- color-handle.css: Phase 2 stub (full S2 styling in Phase 5).
- index.ts class re-export; swc-color-handle.ts side-effect registration.
- empty stories/ and test/ dirs. Covered by existing wildcard exports.

Both package builds succeed and the element registers via
swc-color-handle.js. Updates the migration plan Setup checklist and the
workstream status table.

Refs SWC-2137, SWC-2295

* feat(color-handle): add adaptive styling, api contract, and a11y verification (phases 3-5)

Phase 3 (API): ColorHandleBase now `implements ColorHandleProperties` so the
five-property contract (color, disabled, focused, open, fill) is enforced at
compile time. No static arrays or debug-warn validation (no enums or invalid
combinations); no 1st-gen deprecations (1st-gen exports only the class and
renames nothing; `fill` is additive).

Phase 4 (a11y): verified the primitive stays role-less and name-less with no
tabindex, no cross-root ARIA, and no live regions. Accessibility is owned by
the parent color pickers, and the built-in loupe keeps its SVG aria-hidden.
No code changes required b... (continued)

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