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.

src/cook/fetch.rs

@@ -628,9 +628,9 @@ pub(crate) fn fetch_cargo(
         source_dir = source_dir.join(cargopath);
     }
 
-    let local_redoxer = Path::new("target/release/cookbook_rbos_redoxer");
+    let local_redoxer = Path::new("target/release/cookbook_redbear_redoxer");
     let mut command = if is_redox() && !local_redoxer.is_file() {
-        Command::new("cookbook_rbos_redoxer")
+        Command::new("cookbook_redbear_redoxer")
     } else {
         let cookbook_redoxer = local_redoxer
             .canonicalize()