Spectrum theme review — BOTH passes complete, before the conduit merge

The end of the design-language work and nothing else: colour/token pass plus
the layout pass, with no other feature work mixed in. `main` moved past this
when the conduit in-memory-new-request branch was merged, and the
`theme-review/full-scope-with-layout` BRANCH was moved onto that merge, so this
tag is the only name for the clean boundary.

This is the useful handle for a design-language revert:
  git revert --no-commit pre-theme-review..theme-review-full-scope
drops the design work while leaving the conduit work intact, because the two
never interleave — they meet only at the merge commit.

Contents, over `pre-theme-review`:
  16 commits, ~76 files. core-react (tokens, theme layer, table, chip, card
  selector), jiggleranch-react (kanban, queue, job card), demo-react (explore,
  nav, screenshot harness), plus both CLAUDE.md palette tables.

Scope of each pass is recorded on `theme-review-color-only` and in
ui/docs/theme-review/PASS-2-SCOPE.md.