DEVX-144: fix: bake promtool into ci-full image, add download timeout, speed up tests

src/devx/make/devx.mak

@@ -309,7 +309,7 @@ devx-lint: devx-lint-ruff devx-lint-format devx-typecheck devx-lint-bandit devx-
 # ── Testing ───────────────────────────────────────────────────────────────────
 
 devx-test-unit:
-	@$(DEVX_BIN)/pytest $(DEVX_TEST_PATHS) -q --no-cov
+	@$(DEVX_BIN)/pytest $(DEVX_TEST_PATHS) -q --no-cov -n 8
 
 devx-pytest-cov:
 	@$(DEVX_BIN)/pytest $(DEVX_TEST_PATHS) -n auto --cov=$(DEVX_COV_PKG) --cov-report=term-missing --cov-fail-under=100

src/devx/tools/install_tools.py

@@ -65,8 +65,9 @@ def _ensure_target_dir() -> Path:
 
 
 def _download(url: str, dest: Path) -> None:
-    """Download a file from ``url`` to ``dest``."""
-    urllib.request.urlretrieve(url, dest)  # nosec B310
+    """Download a file from ``url`` to ``dest`` with a 60s timeout."""
+    with urllib.request.urlopen(url, timeout=60) as resp, open(dest, "wb") as f:  # nosec B310
+        shutil.copyfileobj(resp, f)
 
 
 def _download_and_extract_tarball(url: str, binary_name: str) -> Path: