fix(seer): validate autofix API responses

[betegon]

Summary

Malformed Seer autofix responses can cause a TypeError when the CLI reads the response or normalizes its status. Validate responses with the existing AutofixResponseSchema so these failures produce an ApiError at the API boundary.

Existing autofix: null responses and passthrough blocks/artifacts are preserved. This does not add validation of block contents.

Test plan

• Three regression cases cover a null response and missing/non-string status. All three fail against the original implementation and pass with the fix.
• Compatibility assertion verifies that blocks and artifacts survive validation.
• pnpm exec vitest run test/lib/api-client.seer.test.ts test/types/seer.test.ts — 60 tests passed.
• Biome checks on the two changed files — passed.
• git diff --check — passed.
• No live Seer request was run locally.

[vercel]

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Project	Deployment	Actions	Updated
cli	Ready	Preview	Sep 23, 2026 2:41pm UTC

1 Skipped Deployment

Project	Deployment	Actions	Updated
sentry-local	Skipped		Sep 23, 2026 2:41pm UTC