Rename rbos → redbear everywhere, add redbear-info system tool

Replace all 'rbos'/'RBOS' references with 'redbear'/'Red Bear OS'
across the build system, scripts, docs, and configs. Renamed files:
  rbos.ipxe → redbear.ipxe
  assets/rbos-icon.png → assets/redbear-icon.png
  recipes/system/rbos-info → recipes/system/redbear-info

Added redbear-info: a system tool that enumerates all Red Bear OS
custom components, checks runtime availability via scheme paths and
binary presence, and prints status/test info. Supports --verbose,
--json, and --test output modes. Zero external dependencies.

scripts/include-recipes.sh

@@ -11,7 +11,7 @@ if [ -z "$*" ]
 then
     echo "Find matching recipes, and format for inclusion in config"
     echo "Usage: $0 \"pattern\""
-    echo "Must be run from the RBOS build directory"
+    echo "Must be run from the Red Bear OS build directory"
     echo "e.g. $0 \"TODO.*error\""
     exit 1
 fi