packaging: drop the make route and the from-source APKBUILD

imsd had two build descriptions to keep in sync: project.cpp for
crafter-build, and a Makefile mirroring it for distros that build from
source, used by packaging/APKBUILD. CI has not used that route since
2026-09-02 — its apks are a crafter-build binary wrapped by
APKBUILD.binary — and the recipe had not followed the releases: its
pkgver was still 0.3.0.

crafter-build is now the only build. AGENTS.md loses the make route
(§4.2) and describes one recipe (§9.1).

Tested: build-package.sh run end to end on this commit in a privileged
alpine:edge container (podman) on the workstation.

packaging/APKBUILD

@@ -1,58 +0,0 @@
-# SPDX-License-Identifier: GPL-3.0-only
-# SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
-# Maintainer: Jorijn van der Graaf <jorijnvdgraaf@catcrafts.net>
-pkgname=imsd
-pkgver=0.3.0
-pkgrel=0
-pkgdesc="Userspace IMS/VoLTE daemon for mainline Linux phones"
-url="https://forgejo.catcrafts.net/Catcrafts/imsd"
-arch="aarch64 x86_64"
-license="GPL-3.0-only"
-# the media leg dlopen's the AMR-WB codecs; pw-record/pw-play drive PipeWire —
-# none of which abuild's .so auto-scan can see; polkit answers the daemons'
-# call-control check (ImsdBus)
-depends="modemmanager opencore-amr vo-amrwbenc pipewire-tools polkit"
-# clang/libc++ C++26 modules build (see Makefile); llvm-runtimes ships the
-# libc++ std module sources (/usr/share/libc++/v1/std.cppm) it precompiles
-makedepends="clang lld libc++-dev llvm-libunwind-dev llvm-runtimes glib-dev pkgconf"
-# the versioned provides both satisfies soc-qcom-modem's 81voltd dependency
-# and excludes the real package: 81voltd serves the modem's own ims-PDN
-# requests, which races imsd for the PDN and flaps it with a new prefix every
-# ~2.5 min — the two IMS stacks cannot share one PDN
-provides="81voltd=$pkgver-r$pkgrel"
-# imsd-ofono is opt-in: it carries the org.ofono shim that lets GNOME Calls
-# (Phosh, GNOME Mobile) drive imsd, plus the gschema override that repoints
-# Calls at the ofono provider. A Plasma Mobile phone wants imsd-dialerd, which
-# is in the main package, and must NOT get that override.
-subpackages="$pkgname-ofono:ofono"
-# restart the running daemons onto an upgrade (systemd's enqueue-marked)
-install="$pkgname.post-upgrade $pkgname.post-install $pkgname-ofono.post-upgrade $pkgname-ofono.post-install"
-source="$pkgname-$pkgver.tar.gz::$url/archive/v$pkgver.tar.gz"
-builddir="$srcdir/$pkgname"
-
-build() {
-	make
-}
-
-check() {
-	make check
-}
-
-package() {
-	make install DESTDIR="$pkgdir"
-}
-
-ofono() {
-	pkgdesc="GNOME Calls (Phosh, GNOME Mobile) backend for imsd"
-	depends="$pkgname=$pkgver-r$pkgrel calls"
-	amove usr/bin/imsd-ofonod
-	amove usr/libexec/imsd-ofono-restart-calls.sh
-	amove usr/lib/systemd/system/imsd-ofonod.service
-	amove usr/share/dbus-1/system.d/imsd-ofono.conf
-	amove usr/share/glib-2.0/schemas/90_imsd-ofono.gschema.override
-	amove usr/lib/systemd/system-preset/80-imsd-ofono.preset
-	# enabled on install, like imsd.service in the main package
-	mkdir -p "$subpkgdir"/etc/systemd/system/multi-user.target.wants
-	ln -s /usr/lib/systemd/system/imsd-ofonod.service \
-		"$subpkgdir"/etc/systemd/system/multi-user.target.wants/imsd-ofonod.service
-}