lint: apply manual ruff cleanup (non-preview files)

scripts/fastapi-vue/build-frontend.py

@@ -3,7 +3,9 @@
 import sys
 from pathlib import Path
 
-from hatchling.builders.hooks.plugin.interface import BuildHookInterface  # type: ignore
+from hatchling.builders.hooks.plugin.interface import (
+    BuildHookInterface,  # type: ignore[import-not-found]
+)
 
 sys.path.insert(0, str(Path(__file__).parent))
 from buildutil import build

scripts/fastapi-vue/buildutil.py

@@ -30,8 +30,11 @@ def _check_node_version(node_path: str) -> None:
     Raises RuntimeError if version is too old or cannot be determined.
     """
     try:
-        result = subprocess.run(
-            [node_path, "--version"], capture_output=True, text=True, check=True
+        result = subprocess.run(  # noqa: S603
+            [node_path, "--version"],
+            capture_output=True,
+            text=True,
+            check=True,
         )
         version_str = result.stdout.strip()
         # Parse version like "v20.10.0" or "v18.17.1"
@@ -176,16 +179,16 @@ def build(folder: str = "frontend") -> None:
         install_cmd, build_cmd = find_build_tool()
     except RuntimeError as e:
         logger.warning(e)
-        raise SystemExit(1)
+        raise SystemExit(1) from e
 
     def run(cmd):
         display_cmd = [Path(cmd[0]).name, *cmd[1:]]
         logger.info("### %s", " ".join(display_cmd))
-        subprocess.run(cmd, check=True, cwd=folder)
+        subprocess.run(cmd, check=True, cwd=folder)  # noqa: S603
 
     try:
         run(install_cmd)
         logger.info("")
         run(build_cmd)
-    except subprocess.CalledProcessError:
-        raise SystemExit(1)
+    except subprocess.CalledProcessError as e:
+        raise SystemExit(1) from e

scripts/fastapi-vue/devutil.py

@@ -1,6 +1,7 @@
 """Utilities meant for devserver script, used only in source repository with dev deps."""
 
 import asyncio
+import contextlib
 from pathlib import Path
 
 import httpx
@@ -58,10 +59,8 @@ class ProcessGroup:
         # Terminate remaining processes
         for p in self._procs:
             if p.returncode is None:
-                try:
+                with contextlib.suppress(ProcessLookupError):
                     p.terminate()
-                except ProcessLookupError:
-                    pass
 
         # Wait for all to finish (with overall timeout)
         still_running = [p for p in self._procs if p.returncode is None]
@@ -74,10 +73,8 @@ class ProcessGroup:
             except TimeoutError:
                 for p in self._procs:
                     if p.returncode is None:
-                        try:
+                        with contextlib.suppress(ProcessLookupError):
                             p.kill()
-                        except ProcessLookupError:
-                            pass
                         await p.wait()
 
 
@@ -95,10 +92,10 @@ async def ready(url: str, path: str = "") -> None:
                 await client.get(full_url, timeout=1.0)
                 logger.info("✓ Backend ready!")
                 return
-            except httpx.RequestError:
+            except httpx.RequestError as e:
                 if attempt == max_attempts - 1:
                     logger.warning("Backend didn't start in time")
-                    raise SystemExit(1)
+                    raise SystemExit(1) from e
                 await asyncio.sleep(0.1)