VU-1015: require SDK structured output#478
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The structured_output fallback used ?? to chain raw.result into lastOutputText, but ?? only fires for null/undefined — a non-JSON prose string in raw.result blocked the fallback and triggered a hard failure. Now tries both sources independently so JSON in a prior assistant block is always recovered when the SDK omits structured_output. Adds unit tests for all fallback paths and an API-gated integration canary (sdk-output-format.integration.test.ts) to detect when the upstream SDK bug (anthropics/claude-agent-sdk-typescript#277) is fixed. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Fixes VU-1015
Summary
Verification
PR phase evidence