Fix UnicodeDecodeError on Windows in tito module complete (fixes #1184)

Add encoding='utf-8' and errors='replace' to subprocess.run() calls in
workflow.py so unit and integration test output decode correctly on
Windows (cp1252) when output contains UTF-8 characters.

Co-authored-by: Pratham-ja <114498234+Pratham-ja@users.noreply.github.com>

tinytorch/tito/commands/module/workflow.py

@@ -908,6 +908,8 @@ class ModuleWorkflowCommand(BaseCommand):
             [sys.executable, str(dev_file.absolute())],
             capture_output=True,
             text=True,
+            encoding="utf-8",
+            errors="replace",
             cwd=project_root,
             env=env
         )
@@ -964,6 +966,8 @@ class ModuleWorkflowCommand(BaseCommand):
             ],
             capture_output=True,
             text=True,
+            encoding="utf-8",
+            errors="replace",
             cwd=project_root
         )