Add BRAINIALL diarized transcription example

[fasuizu-br]

Summary

• add a headless Trigger.dev task that transcribes one authorized PT-BR or Spanish audio file with the BRAINIALL API
• request speaker diarization and return plain text, speaker count, SRT, and WebVTT
• document setup, privacy, consent, retention, and metered-API boundaries
• add focused unit tests with mocked source and API responses

Safety boundaries

• exact HTTPS source-host allowlist with redirect revalidation
• 25 MB limit enforced from Content-Length and while streaming
• explicit rights-and-consent confirmation before network access
• API key remains server-side; network and provider errors are redacted
• maxAttempts: 1 prevents an automatic repeat of a metered request

Validation

• npm ci --ignore-scripts
• npm run check — 20 tests passed and TypeScript passed
• git diff --check
• staged secret-pattern scan — only documented empty/example values found

Dependency audit note

npm audit --omit=dev reports 19 advisories (1 low, 14 moderate, 4 high, 0 critical), all in the current Trigger.dev 4.5.8 transitive dependency tree. No forced or breaking dependency rewrite was applied in this example.

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