style: reformat for rustfmt 1.96 / ruff 0.15 (cargo fmt + ruff format) (#155)

The :rust: fmt and :python: fmt CI steps failed against the newer toolchain
versions (rustfmt 1.96.0, ruff 0.15.14) — cmd_init.rs assert! wrapping and
test_setup.py. Apply the formatters; no behavior change.

Author: markovejnovic

crates/hm-dsl-engine/harmont-py/tests/test_setup.py

@@ -1,6 +1,7 @@
 """`.setup()` splices a prep step into a toolchain's install chain so that
 action leaves fork from it. One parametrized test over every install-bearing
 toolchain object."""
+
 from __future__ import annotations
 
 import json

crates/hm/tests/cmd_init.rs

@@ -24,12 +24,18 @@ fn init_rust_creates_pipeline_py() {
     assert!(pipeline.exists(), "expected {}", pipeline.display());
 
     let content = std::fs::read_to_string(&pipeline).unwrap();
-    assert!(content.contains("@hm.pipeline"), "expected pipeline decorator");
+    assert!(
+        content.contains("@hm.pipeline"),
+        "expected pipeline decorator"
+    );
     assert!(
         content.contains("hm.rust.project("),
         "expected rust.project() entrypoint, got:\n{content}"
     );
-    assert!(content.contains(".ci()"), "expected the one-call .ci() DAG, got:\n{content}");
+    assert!(
+        content.contains(".ci()"),
+        "expected the one-call .ci() DAG, got:\n{content}"
+    );
     assert!(
         !content.contains("rust.toolchain("),
         "template should not use the legacy toolchain() API, got:\n{content}"