chore(rebase): reconcile with develop and apply ruff format

After rebasing onto current develop:
- chroma.py: keep develop's quarantine_stale_hnsw + UnsupportedFilterError
  validation alongside this PR's _pin_hnsw_threads retrofit.
- tests/test_backends.py: combine quarantine_stale_hnsw and
  _pin_hnsw_threads test sections; ruff format.
- miner.py: propagate the new `files=` kwarg (added on develop in #1183
  for the init -> mine flow) through _mine_impl so the caller can pass
  a pre-scanned file list under the global lock.

mempalace/backends/chroma.py

@@ -153,9 +153,7 @@ def _pin_hnsw_threads(collection) -> None:
         return
     try:
         collection.modify(
-            configuration=UpdateCollectionConfiguration(
-                hnsw=UpdateHNSWConfiguration(num_threads=1)
-            )
+            configuration=UpdateCollectionConfiguration(hnsw=UpdateHNSWConfiguration(num_threads=1))
         )
     except Exception:
         logger.debug("_pin_hnsw_threads modify failed", exc_info=True)