BC-250 console image: custom GNOME recipe with remote admin

Based on 62fixolab/Latest-Bazzite-AMD-BC-250-Patched-Images @ 347fd4d.

Adds on top of the fork:
- recipes/bc250-console-gnome.yml: governor + gnome-remote-desktop +
  openssh-server, sshd enabled, hhd.service masked, no signing module
  (local build + ISO path)
- files/console/usr/bin/bc250-remote-setup: one-time on-box SSH/RDP setup
- files/console/usr/lib/bootc/kargs.d/50-bc250-ttm.toml: ttm memory kargs
- BUILD-CONSOLE.md: build -> ISO -> validation instructions

files/console/ is separate from files/system/ so the 40-CU unlock tooling
stays out of this stable 24-CU image.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

NOTICE

@@ -0,0 +1,44 @@
+Bazzite AMD BC-250 Patched Images
+Copyright 2026 FixoLab
+
+This repository's original files are licensed under the MIT License unless a
+file or vendored directory states otherwise.
+
+The root LICENSE file applies only to this repository's original files. It does
+not relicense third-party projects, vendored sources, base images, packages, or
+container contents.
+
+This project builds on and/or packages work from the following projects:
+
+- Bazzite
+  https://github.com/ublue-os/bazzite
+  License: Apache License 2.0
+
+- vietsman Bazzite BC-250 patched images
+  https://github.com/vietsman/bazzite-deck-patched
+  https://github.com/vietsman/bazzite-gnome-patched
+  https://github.com/vietsman/bazzite-kde-patched
+  License: Apache License 2.0
+
+- cyan-skillfish-governor
+  https://github.com/filippor/cyan-skillfish-governor
+  License: MIT License
+  Note: installed from COPR; not vendored as source in this repository.
+
+- bc250-40cu-unlock
+  https://github.com/duggasco/bc250-40cu-unlock
+  Upstream declared license: GPL-2.0
+  Vendored paths:
+    vendor/bc250-40cu-unlock/
+    files/system/usr/share/bc250-40cu/vendor/bc250-40cu-unlock/
+
+- bc250-cu-live-manager
+  https://github.com/WinnieLV/bc250-cu-live-manager
+  Upstream declared license: none detected at time of review.
+  Vendored paths:
+    vendor/bc250-cu-live-manager/
+    files/system/usr/share/bc250-40cu/vendor/bc250-cu-live-manager/
+
+The experimental 40CU images include third-party research/tooling for BC-250
+runtime CU testing. Those third-party files remain subject to their upstream
+authors' licensing terms and notices.