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MOB-427: cpp_archive prebuilt bundles + .m through the C driver - #132
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A lang: :cpp_archive NIF may declare prebuilt: %{url, sha256, static_libs}.
MobDev.Plugin.Prebuilt downloads the tarball once per hash into
~/.mob/cache/plugin-prebuilt, refuses it unless it matches the pinned sha256,
resolves {:prebuilt, dir} includes and returns the target's listed archives,
which build_plugin_static_archives/3 links beside lib<module>.a through the
existing plugin_static_libs inputs (sim, device, mob.release --ios). Manifest
validation checks the URL, hash and paths. A .m source now goes to the C driver
with :cflags*, so an ObjC NIF can share an archive with an ObjC++ renderer.
Lets mob_scene3d (Filament) build into a blank iOS host from activation alone.
…g, posix errors, stale partial sweep, MOB_PLUGIN_PREBUILT_DIR
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Lets a
lang: :cpp_archiveplugin NIF declareprebuilt: %{url, sha256, static_libs}: downloaded once per hash into ~/.mob/cache/plugin-prebuilt (sha256-pinned, https, bundle-relative paths; checked by mix mob.validate_plugin and again at build),{:prebuilt, dir}includes, target archives linked beside lib.a via the existing plugin_static_libs inputs (sim, device, mob.release --ios)..msources go to the C driver with :cflags*. MOB_PLUGIN_PREBUILT_DIR for offline/mirrors. Decision: decisions/2026-10-09-cpp-archive-prebuilt-bundles.md.Lets mob_scene3d (Filament) build into a blank iOS host from activation alone (companion mob_scene3d PR).
Verification: full mix test green (3035), credo clean. Blank mob.new 0.6.7 host + mob_scene3d branch: iOS 27 sim (iPhone 17) and physical iPhone SE deploy, model renders (scene readback status ready, GPU sample red), mix mob.selftest pass on both; mix mob.release --ios builds .ipa containing OBJC_CLASS$_MobScene3dView; fresh-cache download path exercised; Android emulator build + selftest pass.
Review: reviewer subagent (Codex rate-limited until 2026-10-13): SHIP, then MERGE after fixes (last nitpick fixed in this push).