fix: resolve all ruff lint and format errors across codebase (#7058)

- Auto-fixed 70 lint errors (import sorting, aliased errors, datetime.UTC)
- Fixed 85 remaining errors manually:
  - E501: wrapped long lines in queen_profiles, catalog, routes_credentials
  - F821: added missing TYPE_CHECKING imports for AgentHost, ToolRegistry,
    HookContext, HookResult; added runtime imports where needed
  - F811: removed duplicate method definitions in queen_lifecycle_tools
  - F841/B007: removed unused variables in discovery.py
  - W291: removed trailing whitespace in queen nodes
  - E402: moved import to top of queen_memory_v2.py
  - Fixed AgentRuntime -> AgentHost in example template type annotations
- Reformatted 343 files with ruff format

core/framework/loader/preload_validation.py

@@ -98,9 +98,7 @@ def validate_credentials(
         if not result.success:
             # Preserve the original validation_result so callers can
             # inspect which credentials are still missing.
-            exc = CredentialError(
-                "Credential setup incomplete. Run again after configuring the required credentials."
-            )
+            exc = CredentialError("Credential setup incomplete. Run again after configuring the required credentials.")
             if hasattr(e, "validation_result"):
                 exc.validation_result = e.validation_result  # type: ignore[attr-defined]
             if hasattr(e, "failed_cred_names"):