feat(bench): Apple Silicon UMA mechanical sympathy benchmark (#904)
* feat(bench): add Apple Silicon UMA mechanical sympathy benchmark
Engineering-grade reproducible benchmark measuring exact CGA recall,
Cl(4,1) scalar algebra, FrameVerdict TTFV, array_codec replay, and
honest Python/Rust copy/zero-copy boundaries. Runs without Rust;
skips Rust-only tracks with explicit reasons. Includes claim-safety
audit, CLI integration (core bench --suite apple-uma), and outreach brief.
* fix(bench): patch apple-uma report paths, decode timing, CLI --report
- Use repo-relative report_path in JSON metadata (no absolute paths)
- Measure decode_array only; precompute encode payload before decode bench
- core bench apple-uma --report writes exactly to PATH; --write-report for defaults
- Add final newlines; regenerate seed report
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