Provide world Git identity, reflog fallback, object inspection, and which (T73)

host/src/world.rs

@@ -44,6 +44,7 @@ impl World {
     /// Copy an optional bundle into a new world. Existing worlds retain their programs.
     /// Each `.wasm` tool keeps its independent file and gains a relative `/bin/<name>` symlink.
     /// `/dev` exposes generated null, zero, and random byte devices in every world.
+    /// Missing `/etc/gitconfig` defaults to Sausage <sausage@localhost>. Local repository config overrides it.
     pub fn open_with_userland(dir: &Path, userland: Option<&Path>) -> anyhow::Result<Self> {
         let root_dir = dir.join("world");
         let host_dir = dir.join("host");
@@ -64,6 +65,14 @@ impl World {
                 }
             }
         }
+        let gitconfig = root_dir.join("etc/gitconfig");
+        if !gitconfig.try_exists()? {
+            std::fs::create_dir_all(root_dir.join("etc"))?;
+            std::fs::write(
+                gitconfig,
+                "[user]\n\tname = Sausage\n\temail = sausage@localhost\n",
+            )?;
+        }
         std::fs::create_dir_all(&host_dir)?;
         let mut mounts = Mounts::default();
         mounts.mount(