iOS release: compile + link activated-plugin NIFs

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Problem

mix mob.release --ios produced a binary that failed to link for any app with NIF plugins:

Undefined symbols for architecture arm64:
  "_mob_camera_nif_nif_init", referenced from:
      _erts_static_nif_tab in driver_tab_ios.o
  ... (one per activated plugin)

iOS statically links every NIF into the single app binary (no dlopen under the App Store sandbox), so driver_tab_ios.c references each activated plugin's <module>_nif_init. The dev path (build.zig -Dplugin_c_nifs, fed by MobDev.Plugin.Merge.nif_sources/2) compiles those in — but the release path (release.ex → release_device.sh) is a separate hand-rolled script that predates plugin support and compiled a fixed object list, never touching plugins. Android was unaffected (per-ABI .sos, not one static binary).

Surfaced shipping Sloppy Joe (10 capability plugins) to the App Store.

Fix

Bring the release path to parity. release_env/2 emits two env vars from MobDev.Plugin.activated() via the pure, unit-tested Release.plugin_ios_build_env/1:

• MOB_PLUGIN_IOS_NIF_SOURCES — each activated plugin's iOS C/ObjC NIF source (Merge.nif_sources(activated, :ios))
• MOB_PLUGIN_IOS_FRAMEWORKS — the union of declared frameworks (Merge.ios_frameworks/1)

release_device.sh loops over the sources, compiling each with -DSTATIC_ERLANG_NIF_LIBNAME=<basename> (→ <basename>_nif_init, matching the table) and -fmodules (Clang autolinks every @imported framework — plugins often import beyond their manifest set, e.g. Accelerate). Objects join the swiftc link line; declared frameworks are passed explicitly.

Verified

Sloppy Joe's 10 ObjC NIF plugins compile + link; the resulting .ipa code-signs and validates against its App Store distribution profile (valid on disk, satisfies its Designated Requirement).

Tests

• plugin_ios_build_env/1 — pure matrix (none / one / many / platform-filtered) in release_test.exs
• release_script_test.exs — script-shape assertions (compile loop, libname derivation, $PLUGIN_OBJS on the link, framework flags) so a regression is caught at mix test, not a TestFlight round trip

Also (2nd commit) — a pre-existing test-infra bug

MobDev.Release.HelpersTest's git fixture didn't clear the ambient git env. Inside a git hook (.githooks/pre-push), git exports GIT_DIR/GIT_WORK_TREE/GIT_INDEX_FILE; the fixture inherited them and operated on the outer repo → git commit exited non-zero → setup crashed. Passed standalone, failed only on push. Now cleared on all three git commands.

Scope / follow-up

Covers nif_sources (lang: :c | :objc) + ios_frameworks — what every current plugin uses. The dev path also handles plugin swift_files and :cpp_archive static archives (e.g. mob_nx_eigen); the release path does not yet (no shipped plugin needs them on iOS today). Documented in decisions/2026-07-07-ios-release-links-plugin-nifs.md.

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