Add a `mac` target that cross-compiles an Apple binary via osxcross
(MAC_ARCH=arm64 default, or x86_64), assembles an unsigned yt-offline.app
(Info.plist + Mach-O + best-effort .icns via png2icns), and zips it. The
crypto stack is ring, which builds against the osxcross SDK cleanly.
- Sets the per-target linker + cc-rs CC/CXX/AR env from the osxcross
wrappers (oa64-clang / o64-clang); discovers the versioned ar triple.
- Gated on the toolchain being present: `all` folds it in only when an
Apple rust target + an osxcross wrapper + zip exist, and a bare `mac`
run skips cleanly (exit 0) otherwise — verified.
- Local-only, not in CI: the macOS SDK can't be hosted in a public image.
- Refresh the stale Windows + macOS sections of docs/PACKAGING.md (they
still described the pre-cfg-gating blocked state) and the CI section;
note a possible future MacPorts port. ROADMAP 3.1 updated.
Untested end-to-end (no osxcross/SDK on this box); the scaffolding + skip
path are verified and `all` on a stock box is unaffected.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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