test: use shlex.quote in resume-hint assertions for Windows

The pre-existing test_maybe_run_mine_prompt_declined_prints_hint
asserted the bare unquoted form `mempalace mine {tmp_path}`. After
the production code switched to shlex.quote on the resume hint, this
passed on Linux/macOS (POSIX paths have no characters that trigger
quoting) but failed on Windows where backslashes always get wrapped
in single quotes.

Mirror the production code in the assertion via shlex.quote so it's
portable across platforms; do the same for the two new
spaces-in-path tests for consistency.

tests/test_miner.py

@@ -1,4 +1,5 @@
 import os
+import shlex
 import shutil
 import tempfile
 from pathlib import Path
@@ -674,7 +675,10 @@ def test_mine_keyboard_interrupt_quotes_path_with_spaces_in_resume_hint(tmp_path
             mine(str(project_root), str(palace_path))
 
     out = capsys.readouterr().out
-    assert f"mempalace mine '{project_root}'" in out
+    # Use shlex.quote so the assertion matches whatever the production
+    # code emits on this platform (POSIX paths with spaces vs Windows
+    # paths with backslashes both end up wrapped in single quotes).
+    assert f"mempalace mine {shlex.quote(str(project_root))}" in out
 
 
 def test_mine_cleans_up_pid_file_on_interrupt(tmp_path):