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Vance Ingalls
37d02f26a2
## What
Extends `getVariables.test.ts` with T8 from the SDK migration test plan: override-set merge semantics.
## Tests (4 new)
- **last-write-wins** — calling `setOverrides` twice; second value wins
- **sparse override** — override one key, unmentioned declared defaults survive intact
- **batch override (brand kit)** — setting all keys at once via a single override object
- **manual override after batch** — replacing one key from a kit batch; others untouched
## Scope note
Tests are labeled **"flat-merge, current behaviour"** — `getVariables` does `{...defaults, ...overrides}`. Dotted-key path resolution (`"headline.color"` as `id.prop`) is a future SDK concern; these tests validate the flat-merge contract that exists today, not the future path-resolution semantics.
## Stack
Stacked on T1 (#1240). Prerequisite for T11 (#1242), T4 (#1243).