Goal

Do two testing slices in order:

1. move the cheap fake-slow package-integration specs back into the fast lane
2. add one narrow non-React layout coverage pass

Scope

Slice 1: slow -> fast reclaim

Move these files from *.slow.* back to *.spec.*:

• apps/www/src/__tests__/package-integration/ai-utils/aiCommentToRange.slow.tsx
• apps/www/src/__tests__/package-integration/ai-utils/findTextRangeInBlock.slow.tsx
• apps/www/src/__tests__/package-integration/markdown-rich/defaultRule.slow.ts
• apps/www/src/__tests__/package-integration/markdown-rich/serializeMd.slow.tsx
• apps/www/src/__tests__/package-integration/markdown-deserializer/deserializeMdParagraphs.slow.tsx

Keep the real heavy suites slow by design.

Slice 2: layout

Stay in packages/layout/src/lib/** only.

Best seams:

• insertColumn.ts
• insertColumnGroup.ts
• moveMiddleColumn.ts
• resizeColumn.ts
• withColumn.ts

Verification

Slice 1

• targeted bun test on the renamed files
• pnpm test:profile -- --top ...
• pnpm test:slow

Slice 2

• targeted bun test on touched layout specs
• pnpm test:profile -- --top ...
• pnpm test:slowest -- --top ...
• pnpm install
• pnpm turbo build --filter=./packages/layout
• pnpm turbo typecheck --filter=./packages/layout
• pnpm lint:fix

Notes

• No /react work in layout.
• No fake smoke tests.
• If direct tests expose a real runtime bug, fix the smallest seam and record it.

Result

Slice 1

• Moved these files back to fast:
  • apps/www/src/__tests__/package-integration/ai-utils/aiCommentToRange.spec.tsx
  • apps/www/src/__tests__/package-integration/ai-utils/findTextRangeInBlock.spec.tsx
  • apps/www/src/__tests__/package-integration/markdown-rich/defaultRule.spec.ts
  • apps/www/src/__tests__/package-integration/markdown-rich/serializeMd.spec.tsx
  • apps/www/src/__tests__/package-integration/markdown-deserializer/deserializeMdParagraphs.spec.tsx
• Deleted stale slow-name snapshot files left behind by the rename.
• Verified the reclaimed files are nowhere near the fast-lane budget.

Slice 2

• Added:
  • packages/layout/src/lib/transforms/insertColumn.spec.ts
  • packages/layout/src/lib/transforms/insertColumnGroup.spec.ts
  • packages/layout/src/lib/transforms/moveMiddleColumn.spec.ts
  • packages/layout/src/lib/transforms/resizeColumn.spec.ts
  • packages/layout/src/lib/withColumn.spec.ts
• Fixed packages/layout/src/lib/withColumn.ts so invalid column groups unwrap their content instead of dropping it or crashing during normalization.

Verification

• bun test apps/www/src/__tests__/package-integration/ai-utils/aiCommentToRange.spec.tsx apps/www/src/__tests__/package-integration/ai-utils/findTextRangeInBlock.spec.tsx apps/www/src/__tests__/package-integration/markdown-rich/defaultRule.spec.ts apps/www/src/__tests__/package-integration/markdown-rich/serializeMd.spec.tsx apps/www/src/__tests__/package-integration/markdown-deserializer/deserializeMdParagraphs.spec.tsx
• pnpm test:profile -- --top 15 apps/www/src/__tests__/package-integration/ai-utils apps/www/src/__tests__/package-integration/markdown-rich apps/www/src/__tests__/package-integration/markdown-deserializer
• pnpm test:slow
• bun test packages/layout/src
• pnpm test:slowest -- --top 20 apps/www/src/__tests__/package-integration/ai-utils apps/www/src/__tests__/package-integration/markdown-rich apps/www/src/__tests__/package-integration/markdown-deserializer packages/layout/src
• pnpm install
• pnpm turbo build --filter=./packages/layout
• pnpm turbo typecheck --filter=./packages/layout
• pnpm lint:fix