style: apply ruff format to all source and test files

Fixes ruff format --check CI failure. 22 files reformatted to satisfy
the ruff formatter's style requirements. No logic changes, only
whitespace/formatting adjustments.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/skill_seekers/cli/parsers/workflows_parser.py

@@ -80,6 +80,4 @@ class WorkflowsParser(SubcommandParser):
             "validate",
             help="Parse and validate a workflow by name or file path",
         )
-        validate_p.add_argument(
-            "workflow_name", help="Workflow name or path to YAML file"
-        )
+        validate_p.add_argument("workflow_name", help="Workflow name or path to YAML file")