add nix/tamal/manifest.kdl: fresh-cmd queries kepr saves.json to pin latest nina save automatically

@@ -0,0 +1,17 @@1+version "1.1.0"2+inputs {3+  nina {4+    archive {5+      url "https://kepr.uk/nina/archive/{{fresh_value}}.tar.gz"6+    }7+    hash algorithm=SHA-2568+    // Query kepr saves.json to get the latest nina save ID dynamically.9+    // nixtamal KDL requires combined flags (e.g. -d: not -d ":"), no integer args.10+    fresh-cmd {11+      $ curl -fsS "https://kepr.uk/nina/saves.json"12+      | cut -d: -f213+      | cut -d, -f114+      | tr -d "\""15+    }16+  }17+}