- toolchain/build-vendor.sh: packages the observability components that
are not in Debian main — grafana (official OSS deb, vendored as-is),
loki + promtail (static binaries from the Loki GitHub release, wrapped
in minimal debs that install the overlays/server configs and systemd
units from toolchain/vendor/). Version-pinned, overridable, and
download failures skip with a warning (never break the OS build).
- configure-system.sh: auto-enables grafana-server/loki/promtail when
their binaries land in the image.
- New `make vendor` target.
18167fc70e