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GPU warmup (src/transcriber.rs): After creating WhisperState, run a 1s silent inference pass in load(). CUDA JIT-compiles device kernels on the first whisper_full_with_state call. On a cold GPU this compilation disrupts the decode pipeline mid-inference, returning 0 segments in ~0.5s. The warmup forces all kernel compilation at startup so the first real job runs on fully compiled kernels. test_all.sh: - Fix submit response field: 'id' → 'job_id' (was breaking all downstream steps) - Remove language=auto: not a valid ISO 639-1 code; omit field for auto-detect - Make BASE and AUDIO configurable via env vars (WHISPER_BASE_URL, TEST_AUDIO) - Fix DELETE assertion: completed jobs return 409 Conflict, not 204 - Add explicit zero-segments failure check in quality inspection (step 9) - Add progress reporting to poll loop docs/FINDINGS.md + KNOWLEDGE.md: Document cold GPU warmup issue, root cause, and fix. Document language=auto as invalid API usage. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>