Decode Google Vertex authorized_user ADC OAuth token refresh responses from bytes so gzip-compressed token payloads still expose access_token. Adds a regression test for the compressed token response path while preserving plain JSON handling and the custom fetch seam.
Proof: OPENCLAW_VITEST_MAX_WORKERS=1 node scripts/run-vitest.mjs extensions/google/transport-stream.test.ts; pnpm exec oxfmt --check extensions/google/vertex-adc.ts extensions/google/transport-stream.test.ts; pnpm tsgo:extensions; git diff --check origin/main...HEAD; autoreview --mode branch --base origin/main. PR CI check-test-types failure was reproduced on current origin/main 607bbe4f5c and is unrelated to this two-file Google provider change.
Thanks @liaoandi for the fix and live Google Vertex ADC proof.
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