refactor(context): clearer fetch_context exhaustiveness; drop no-op mkdir

Replace unreachable Err arms with explicit panic message if fetch_context
ever returns a non-404 error. Remove create_dir_all on pull (path is always
cwd + single filename segment).

Author: eddietejeda

src/context.rs

@@ -173,7 +173,7 @@ pub fn show(workspace_id: &str, name: &str) {
             );
             std::process::exit(1);
         }
-        Err(_) => unreachable!(),
+        Err(status) => panic!("unexpected error status from fetch_context: {status}"),
     }
 }
 
@@ -203,7 +203,7 @@ pub fn pull(workspace_id: &str, name: &str, force: bool, dry_run: bool) {
             );
             std::process::exit(1);
         }
-        Err(_) => unreachable!(),
+        Err(status) => panic!("unexpected error status from fetch_context: {status}"),
     };
 
     let n_chars = ctx.content.chars().count();
@@ -215,13 +215,6 @@ pub fn pull(workspace_id: &str, name: &str, force: bool, dry_run: bool) {
         return;
     }
 
-    if let Some(parent) = path.parent() {
-        if let Err(e) = fs::create_dir_all(parent) {
-            eprintln!("error: could not create directory {}: {e}", parent.display());
-            std::process::exit(1);
-        }
-    }
-
     let mut f = fs::File::create(&path).unwrap_or_else(|e| {
         eprintln!("error: could not create {}: {e}", path.display());
         std::process::exit(1);