Benjamin Carlsson 379d50be35 Add pinned native voice source preparation (#41884) ...

## What changed

- Pin the GStreamer, codec, native library, and build-tool archives needed by
  the native voice runtime, including their SHA-256 digests.
- Add lazy Bazel repositories and a manual `//third_party/voice:sources` target
  for fetching and unpacking the pinned archives.
- Add an offline Python adapter that verifies archive identity and extraction
  bounds, refuses existing output directories, cleans up failed preparations,
  and records a completion receipt.
- Document that this stage prepares source inputs only; it does not compile or
  link the libraries or enable voice.

## Testing

- Add unit coverage for digest failures, unsafe links, expansion limits,
  cleanup after extraction failures, existing-output preservation, and systems
  where archive links cannot be created.

GitOrigin-RevId: 42a71d7b6b91d49b3954a40932033c44f9861f04

2026-08-31 17:25:50 +00:00

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