Goal

Move /Users/zbeyens/git/slate-v2/packages/slate/test fully onto Bun and remove slate from the Mocha lane.

Constraints

• keep slate-history on its current Mocha lane
• preserve skipped legacy fixtures as skipped
• preserve the batch-dirty checks for insertNodes and insertFragment
• keep the root Bun preload handling for legacy TSX fixtures

Findings

• packages/slate/test/index.js is the blocker because fixtures import jsx from it while it also bootstraps the whole Mocha suite
• the suite shape is already well-defined in the current Mocha entry: interfaces, operations, normalization, transforms, utils/deep-equal, plus extra batch-dirty passes for two transform lanes
• the only other direct slate runtime test file is packages/slate/test/utils/string.ts
• Bun already carries the migrated above and edges slices, so the preload and fixture import path are good enough to cut the whole package over
• a few CustomTypes helper files needed import type so Bun would stop trying to load type-only Slate exports at runtime

Plan

1. Turn packages/slate/test/index.js into a pure helper module
2. Add one Bun suite entry for the whole slate fixture corpus
3. Remove the temporary per-bucket Bun specs
4. Switch packages/slate and root scripts so slate is Bun-only
5. Verify build, typecheck, lint, Bun, and the remaining slate-history Mocha lane

Verification

• pnpm --filter slate test
• pnpm turbo build --filter=./packages/slate
• pnpm turbo typecheck --filter=./packages/slate
• pnpm lint:fix
• pnpm test:bun
• pnpm test:mocha