test(sandbox): update v3 paths-aware tests for FR1+FR3 invariants

- test_paths.py: explicit initialize_paths(<empty_config>) instead of
  SLOP_CONFIG env var (v3 design); add restore_paths fixture so other
  tests keep their conftest workspace init.
- test_summary_cache.py: use tmp_path (under ./tests/) instead of
  hardcoded Path('.test_cache') that FR1 blocks.
- test_orchestrator_pm_history.py: use tempfile.mkdtemp() instead of
  writing to project-root 'test_conductor/' that FR1 blocks.
- test_gui_paths.py::test_save_paths: mock src.paths.initialize_paths
  instead of src.paths.reset_paths (v3 entry point).

All 12 tests pass in the Tier 2 clone after these fixes.

tests/test_summary_cache.py

@@ -9,11 +9,10 @@ def test_get_file_hash():
  expected = "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"
  assert get_file_hash(content) == expected
 
-def test_summary_cache():
- cache_dir = Path(".test_cache")
- if cache_dir.exists():
-  shutil.rmtree(cache_dir)
- cache_file = cache_dir / "cache.json"
+def test_summary_cache(tmp_path):
+ # v3 paths.py: use tmp_path (which is under ./tests/) instead of
+ # hardcoded project-root paths that the FR1 guard blocks.
+ cache_file = tmp_path / "cache.json"
  
  cache = SummaryCache(str(cache_file))
  
@@ -35,16 +34,11 @@ def test_summary_cache():
  # Test persistence
  cache2 = SummaryCache(str(cache_file))
  assert cache2.get_summary(file_path, content_hash) == summary
- 
- # Cleanup
- if cache_dir.exists():
-  shutil.rmtree(cache_dir)
 
-def test_summary_cache_lru():
- cache_dir = Path(".test_cache_lru")
- if cache_dir.exists():
-  shutil.rmtree(cache_dir)
- cache_file = cache_dir / "cache.json"
+
+def test_summary_cache_lru(tmp_path):
+ # v3 paths.py: use tmp_path instead of hardcoded project-root paths.
+ cache_file = tmp_path / "cache.json"
  
  # Create cache with max 2 entries
  cache = SummaryCache(str(cache_file), max_entries=2)
@@ -64,9 +58,6 @@ def test_summary_cache_lru():
  assert cache.get_summary("file3.py", "hash3") is None
  assert cache.get_summary("file2.py", "hash2") == "summary2"
  assert cache.get_summary("file4.py", "hash4") == "summary4"
- 
- if cache_dir.exists():
-  shutil.rmtree(cache_dir)
 
 if __name__ == "__main__":
  test_get_file_hash()