chore: ruff cleanup — fix 7 long-standing lint findings

Mechanical, no behavior change. `ruff check src/ tests/` now passes
with zero findings.

- cli.py:147 (SIM105) — replace `try/except SynologyError/pass` around
  the cleanup logout with `contextlib.suppress(SynologyError)`.
- compose.py:271 (B007) — drop the unused `i` from the env_list
  preview-detection loop (the apply loop below still uses enumerate).
- compose.py:329 (E501) — extract `verb = "Updated" if … else "Added"`
  into a local before the return so the f-string fits in 100 cols.
- images.py:237 (E501) — extract `stopped_name = in_use_stopped[0]`
  before the return and split the message across two f-strings.
- test_auth.py:38, 127, 140 (SIM117) — combine nested `with patch(…):`
  / `with pytest.raises(…):` into single parenthesised with-statements.

236 tests pass.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/mcp_synology_container/cli.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import asyncio
+import contextlib
 import json
 import logging
 import sys
@@ -144,10 +145,8 @@ async def _run_setup() -> None:
                 client.sid = sid
                 click.echo(click.style("Login successful!", fg="green"))
                 # Logout cleanly
-                try:
+                with contextlib.suppress(SynologyError):
                     await client.request("SYNO.API.Auth", "logout", version=6, params={})
-                except SynologyError:
-                    pass
             else:
                 click.echo(click.style("Login failed: no session ID returned.", fg="red"), err=True)
                 sys.exit(1)

src/mcp_synology_container/modules/compose.py

@@ -268,7 +268,7 @@ def register_compose(mcp: FastMCP, config: AppConfig, client: DsmClient) -> None
         # Determine previous value and build description
         old_value: str | None = None
         if isinstance(env_list, list):
-            for i, entry in enumerate(env_list):
+            for entry in env_list:
                 if isinstance(entry, str) and entry.startswith(f"{var_name}="):
                     old_value = entry.split("=", 1)[1]
                     break
@@ -325,8 +325,9 @@ def register_compose(mcp: FastMCP, config: AppConfig, client: DsmClient) -> None
         except Exception as e:
             return f"Error writing compose file: {e}"
 
+        verb = "Updated" if action == "update" else "Added"
         return (
-            f"{'Updated' if action == 'update' else 'Added'} env var in '{service_name}' ({project_name}):\n"
+            f"{verb} env var in '{service_name}' ({project_name}):\n"
             f"  {var_name}={var_value}\n\n"
             f"Tip: Run redeploy_project('{project_name}', confirmed=True) to apply the change."
         )

src/mcp_synology_container/modules/images.py

@@ -233,8 +233,10 @@ def register_images(mcp: FastMCP, config: AppConfig, client: DsmClient) -> None:
             )
 
         if in_use_stopped:
+            stopped_name = in_use_stopped[0]
             return (
-                f"Cannot delete '{display_name}': image is used by stopped container '{in_use_stopped[0]}'.\n"
+                f"Cannot delete '{display_name}': image is used by stopped container "
+                f"'{stopped_name}'.\n"
                 f"Delete the container first or run system_prune to clean up stopped containers."
             )
 

tests/test_auth.py

@@ -35,8 +35,10 @@ def test_resolve_credentials_no_credentials(monkeypatch):
     config = make_config()
     auth = AuthManager(config)
 
-    with patch("keyring.get_password", return_value=None):
-        with pytest.raises(AuthenticationError, match="No credentials found"):
+    with (
+        patch("keyring.get_password", return_value=None),
+        pytest.raises(AuthenticationError, match="No credentials found"),
+    ):
         auth.resolve_credentials()
 
 
@@ -124,8 +126,10 @@ async def test_login_2fa_required():
     mock_client = AsyncMock()
     mock_client.request.side_effect = SynologyError("2FA required", code=403)
 
-    with patch.object(auth, "resolve_credentials", return_value=("user", "pass", None)):
-        with pytest.raises(AuthenticationError, match="2FA is required"):
+    with (
+        patch.object(auth, "resolve_credentials", return_value=("user", "pass", None)),
+        pytest.raises(AuthenticationError, match="2FA is required"),
+    ):
         await auth.login(mock_client)
 
 
@@ -137,8 +141,10 @@ async def test_login_no_sid_returned():
     mock_client = AsyncMock()
     mock_client.request.return_value = {}  # No 'sid' key
 
-    with patch.object(auth, "resolve_credentials", return_value=("user", "pass", None)):
-        with pytest.raises(AuthenticationError, match="no session ID"):
+    with (
+        patch.object(auth, "resolve_credentials", return_value=("user", "pass", None)),
+        pytest.raises(AuthenticationError, match="no session ID"),
+    ):
         await auth.login(mock_client)