Rebuilding Setrika's FFmpeg CLI pair (macOS arm64)

The exact unmodified source archive and detached PGP signature are included.
Version: 9.0.2
Archive SHA256: 8c3850283eb25fa026482078a04051e0be17347b09ef81a0849bec15a96e002e
Official URL: https://ffmpeg.org/releases/ffmpeg-9.0.2.tar.xz
Pinned official release signing fingerprint:
FCF986EA15E6E293A5644F10B4322F04D67658D8

Requirements: arm64 macOS, Apple Command Line Tools/SDK with clang and make,
Python 3.12 or newer for the repository helper, GnuPG to check the signature.
No encoder/codec libraries or Homebrew FFmpeg development libraries are needed.
The build uses macOS system zlib and Secure Transport. Deployment target 11.0
is a compiler setting, not evidence that the binaries were tested on macOS 11.

1. Check SHA256 and use an isolated GnuPG home to import ffmpeg-devel.asc,
   verify its fingerprint matches the value above, and verify the .tar.xz.asc
   detached signature against the archive. The same fingerprint is published
   at https://ffmpeg.org/download.html . Keep source-verification.txt.
2. Extract ffmpeg-9.0.2.tar.xz. Create a separate empty build directory; do not
   edit the extracted tree. Source patches: none (changes.diff is empty).
3. In that build directory invoke ../ffmpeg-9.0.2/configure followed by every
   argument in BUILD.json's configure list (omit its leading ./configure).
   The prefix is /setrika-ffmpeg as a staging name, not a system install path.
   Set LC_ALL=C, SOURCE_DATE_EPOCH=1789699562 and ZERO_AR_DATE=1. Unset injected
   compiler/linker/include/library flags and set PKG_CONFIG_LIBDIR to an empty
   directory so unrelated external components cannot be detected.
4. Run make -j4, then make DESTDIR=/absolute/path/to/your/stage install.
   The outputs are stage/setrika-ffmpeg/bin/ffmpeg and ffprobe. FFmpeg's own
   libraries are statically included in these CLI executables; the application
   does not link them. Move/copy this pair together with the notices/source.
5. Run audit_setrika_ffmpeg.py --ffmpeg /path/to/ffmpeg --ffprobe /path/to/ffprobe
   --output AUDIT.json. Read its limited scope. It must reject GPL/nonfree/v3,
   external Homebrew dependencies and missing replay features.
6. Repeat the actual replay/preview/PTS smoke tests from the repository plan.
   A successful compile/audit alone is not behavioral or platform acceptance.

Repository helper:
python3 tools/build_setrika_ffmpeg.py --jobs 4
Its default output is .runtime/cetrika-dev/ffmpeg-lgpl/stage/setrika-ffmpeg.
The included helper snapshots document this recipe; when using them directly,
retain their repository-relative tools/ and assets/third-party/ffmpeg/ layout.
The manual configure/make recipe above does not require Setrika source code.

Builds are source/configuration reproducible, not promised byte-identical across
Apple compiler/SDK versions. BUILD.json records compiler and output hashes.
Windows cross/native build remains unqualified. Do not reuse the Mac artifacts
or treat the macOS dependency audit as a Windows PE/DLL audit.