V3 deterministic audio-transform capability pack. By-value connector composition (service_kind=cli, no separate ingredient): the local SoX CLI exposes readiness, local audio header inspection, duration probing, ASR-friendly WAV conversion, normalized ASR-friendly WAV conversion, telephony WAV conversion, and fixed 30-second preview WAV extraction. Fixed-function and reproducible: conversion happens locally before any model sees the audio. Write-tier operations write only to an engine-managed throwaway output dir and captured WAVs are surfaced as result.file_ref; downstream audio.transcribe / ai-* steps consume them through Gateway-gated file refs. The transform source can be a data.file ref or a trusted local path; path-based inspection ops return stdout text and intentionally do not materialize file_ref input. The pack exposes no arbitrary SoX effects, effect files, combiner modes, playback/recording devices, shell wrapper, stdin/stdout audio pipes, caller-controlled output path, environment override, or network egress. Requires the sox binary and relevant codec support on PATH (Debian/Ubuntu: apt install sox; macOS: brew install sox).