scripts: unify Linux native builds and retain restore caches [CI]

Build musl and glibc for amd64 and arm64 through one native package path. Reuse musl outputs for OCI images and OpenWrt installers, and export binaries inside a rootless unshare session.

Restore the executable dependency graph into a shared persistent NuGet cache, build managed dependencies once, and run isolated native publishes in parallel.

Clean temporary outputs and expired image layers under store locks, retire inactive legacy stores after seven days, and retain two toolchain exports. Add regression coverage for staging, extraction, packaging and cleanup boundaries.

packaging/container/Agent.Containerfile

@@ -2,12 +2,11 @@ FROM mcr.microsoft.com/dotnet/runtime-deps:10.0-alpine
 
 ARG APP_VERSION=unknown
 LABEL org.opencontainers.image.title="MoShiro Agent" \
-      org.opencontainers.image.description="MoShiro node for Linux: listens and dials (MOSHIRO_MODE=agent) or only dials (MOSHIRO_MODE=dial)" \
+      org.opencontainers.image.description="MoShiro Agent for Linux: listens and dials" \
       org.opencontainers.image.licenses="Apache-2.0" \
       org.opencontainers.image.version="$APP_VERSION"
 
 COPY --chown=1654:1654 app/moshiro-agent /usr/local/bin/moshiro-agent
-COPY --chown=1654:1654 app/lib*.so.* /usr/local/bin/
 COPY --chown=1654:1654 app/fleet-enroll /usr/local/bin/fleet-enroll
 COPY --chown=1654:1654 config/ /etc/moshiro/
 COPY --chown=1654:1654 --chmod=0755 entrypoint.sh /usr/local/bin/moshiro-entrypoint