fix(ai): return transformed array output elements

[he-yufeng]

Summary

• return validated array elements from generateObject({ output: "array" })
• return validated array elements from Output.array().parseCompleteOutput
• add regression coverage for schema transforms in both final array paths

Fixes #15707.
Fixes #15708.

To verify

• pnpm install --frozen-lockfile --filter ai...
• pnpm --filter ai test:node -- src/generate-text/output.test.ts src/generate-object/generate-object.test.ts
• pnpm --filter ai type-check
• pnpm exec ultracite check packages/ai/src/generate-text/output.ts packages/ai/src/generate-text/output.test.ts packages/ai/src/generate-object/output-strategy.ts packages/ai/src/generate-object/generate-object.test.ts
• git diff --check

[lgrammel]

Hi! please sign the commits (see https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits ) and add a patch changeset

[lgrammel]

Landed #15734 - the generateObject part of this PR is still relevant. Please update, sign commits, and add a changeset. Thanks!

[he-yufeng]

Updated the branch in 1204bbb4f.

What changed:

• rebased onto current main
• dropped the already-landed generateText side of the original patch
• kept the still-relevant generateObject array transform fix
• added a patch changeset for ai

Validation:

pnpm --filter ai exec vitest --config vitest.node.config.js --run src/generate-object/generate-object.test.ts
# 41 passed

pnpm --filter ai exec vitest --config vitest.edge.config.js --run src/generate-object/generate-object.test.ts
# 41 passed

pnpm --filter ai exec tsc --build
# passed

pnpm --filter ai build
# passed

pnpm konsistent
# passed

pnpm exec ultracite check .changeset/clean-arrays-parse.md packages/ai/src/generate-object/generate-object.test.ts packages/ai/src/generate-object/output-strategy.ts
# passed

git diff --check origin/main..HEAD
# passed

One local note: the broader pnpm exec turbo build --filter=ai command is blocked on Windows by packages/test-server using rm -rf in its clean script, so I validated the ai package build directly after rebuilding the workspace dependencies it imports.