fix(build): prepare alpha release validation and sysext cleanup

.github/copilot-instructions.md

@@ -0,0 +1,8 @@
+# Bluefin Server — Copilot Instructions
+
+Read [`AGENTS.md`](../AGENTS.md) for the full repo contract — build commands,
+PR rules, mandatory gates, and boundaries.
+
+## Skill routing
+
+Use [`docs/skills/index.md`](../docs/skills/index.md) to route to the skill for your task.

AGENTS.md

@@ -9,7 +9,8 @@ Bluefin Server is an FSDK-based, image-based Linux server OS. It produces:
 
 1. Read this file.
 2. Load [`docs/skills/index.md`](docs/skills/index.md) to route to the skill for your task.
-3. Never guess label names, workflow secrets, or infrastructure hostnames — check the relevant skill.
+3. Cross-repo factory directives: follow [`projectbluefin/common:docs/factory/agentic-model.md`](https://github.com/projectbluefin/common/blob/main/docs/factory/agentic-model.md) — query `projectbluefin` MCP (`search_knowledge`) before investigating or implementing.
+4. Never guess label names, workflow secrets, or infrastructure hostnames — check the relevant skill.
 
 ## Hard rules
 

CONTEXT.md

@@ -0,0 +1,21 @@
+# Bluefin Server
+
+An immutable, Freedesktop-SDK-based Linux server operating system providing native systemd update and extension mechanisms.
+
+## Language
+
+**OS DDI**:
+The immutable raw disk image payload containing the base operating system root filesystem.
+_Avoid_: base image, OS rootfs, root tarball
+
+**Installer**:
+A bootable GPT raw disk image executing systemd-repart to partition and install Bluefin Server onto target media.
+_Avoid_: live ISO, installation media, setup script
+
+**Sysext**:
+A systemd-sysext extension raw image merged into `/usr` to deliver decoupled server runtimes such as k0s.
+_Avoid_: addon, plugin, package, sidecar
+
+**Transfer**:
+A systemd-sysupdate definition mapping a remote release asset to a local target file or partition.
+_Avoid_: update manifest, download job, sync rule

Justfile

@@ -22,6 +22,8 @@ export fsdk_ref := `grep -E '^\s*ref:' elements/freedesktop-sdk.bst | head -1 |
 bst *ARGS:
     #!/usr/bin/env bash
     set -euo pipefail
+    export CONTAINERS_CONF="${CONTAINERS_CONF:-/dev/null}"
+    export CONTAINERS_CONF_OVERRIDE="${CONTAINERS_CONF_OVERRIDE:-/dev/null}"
     mkdir -p "${HOME}/.cache/buildstream"
     # shellcheck disable=SC2086
     {{sudo_cmd}} podman run --rm \

elements/bluefin-server/linux-firmware-split.bst

@@ -5,6 +5,8 @@ build-depends:
   - freedesktop-sdk.bst:components/linux-firmware.bst
 
 config:
+  integrate: False
+
   # Exclude debug symbols, development files, and locales from composed output
   exclude:
     - debug

elements/bluefin-server/os-rootfs.bst

@@ -9,3 +9,4 @@ config:
     - debug
     - devel
     - doc
+  integrate: False

elements/bluefin-server/os-stack.bst

@@ -2,8 +2,9 @@ kind: stack
 description: Stack containing all elements required to build a pure DDI Bluefin Server rootfs.
 
 depends:
-  # Base runtime & core libraries
+  # Base runtime & core libraries (minimal non-GNU base + uutils modern userspace)
   - freedesktop-sdk.bst:public-stacks/runtime-minimal.bst
+  - bluefin-server/uutils-coreutils.bst
   - freedesktop-sdk.bst:components/ca-certificates.bst
   - freedesktop-sdk.bst:components/tzdata.bst
   - freedesktop-sdk.bst:integration/extra-fs.bst