fix(cli): write compress output to mempalace_closets so palace can read them (#1244)

`cmd_compress` was writing AAAK-compressed drawers to a `mempalace_compressed`
collection, but every read path (`palace.get_closets_collection`,
`searcher.py`, `repair.py`) reads from `mempalace_closets`. Result: for
non-mined palaces (or any palace where the user ran `mempalace compress`
expecting to backfill the closet/index layer), the compressed output was
silently invisible — written to a collection nothing else opens.

Fix the writer rather than renaming the readers: "closets" is the
user-visible feature name baked into the public API
(`get_closets_collection`), the searcher hybrid path, repair/HNSW
diagnostics, and docs. Renaming the readers would churn 15+ call sites
and the README for no benefit. The compressed AAAK strings are exactly
what closets are conceptually — compact pointers scanned by an LLM to
locate the right drawer — so they belong in `mempalace_closets`.

Tests:
- Update `test_cmd_compress_stores_results` to assert the collection
  name passed to `get_or_create_collection` is `mempalace_closets`.
- Add `test_cmd_compress_output_readable_via_get_closets_collection`:
  end-to-end with a real ChromaBackend, seed a drawer, run cmd_compress,
  then read back via the same `get_closets_collection` helper that
  palace.py / searcher use. Regression test for the wrong-collection
  bug.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/test_cli.py

@@ -889,7 +889,7 @@ def test_cmd_compress_with_config(mock_config_cls, tmp_path, capsys):
 
 @patch("mempalace.cli.MempalaceConfig")
 def test_cmd_compress_stores_results(mock_config_cls, capsys):
-    """Non-dry-run compress stores to mempalace_compressed collection."""
+    """Non-dry-run compress stores to mempalace_closets collection (#1244)."""
     mock_config_cls.return_value.palace_path = "/fake/palace"
     args = argparse.Namespace(palace=None, wing=None, dry_run=False, config=None)
     mock_col = MagicMock()
@@ -927,6 +927,53 @@ def test_cmd_compress_stores_results(mock_config_cls, capsys):
     assert "Stored" in out
     assert "Total:" in out
     mock_comp_col.upsert.assert_called_once()
+    # Verify the compress output goes to the closets collection so that
+    # palace.get_closets_collection() / searcher can read it back (#1244).
+    (call_args, _kwargs) = mock_backend.get_or_create_collection.call_args
+    assert call_args[1] == "mempalace_closets", (
+        f"compress should write to mempalace_closets, got {call_args[1]!r}"
+    )
+    assert "mempalace_closets" in out
+
+
+def test_cmd_compress_output_readable_via_get_closets_collection(tmp_path, capsys):
+    """End-to-end: cmd_compress output must be readable via the same code
+    path palace.py uses (`get_closets_collection`). Regression for #1244."""
+    from mempalace.backends.chroma import ChromaBackend
+    from mempalace.palace import get_closets_collection, get_collection
+
+    palace_path = str(tmp_path / "palace")
+
+    # Seed a drawer in the palace so cmd_compress has something to compress.
+    drawers = get_collection(palace_path, "mempalace_drawers", create=True)
+    drawers.upsert(
+        ids=["drawer-1"],
+        documents=["The quick brown fox jumps over the lazy dog."],
+        metadatas=[{"wing": "test", "room": "demo", "source_file": "fox.txt"}],
+    )
+
+    args = argparse.Namespace(palace=palace_path, wing=None, dry_run=False, config=None)
+    with patch("mempalace.cli.MempalaceConfig") as mock_config_cls:
+        mock_config_cls.return_value.palace_path = palace_path
+        # Use a real ChromaBackend so the write actually lands on disk and
+        # the read-side helper can find it.
+        with patch("mempalace.backends.chroma.ChromaBackend", side_effect=ChromaBackend):
+            cmd_compress(args)
+
+    out = capsys.readouterr().out
+    assert "Stored" in out
+
+    # Now read via the *same* code path palace.py / searcher uses.
+    closets = get_closets_collection(palace_path, create=False)
+    got = closets.get(ids=["drawer-1"], include=["documents", "metadatas"])
+    assert got["ids"] == ["drawer-1"], (
+        "compressed drawer not found in mempalace_closets — "
+        "cmd_compress wrote to the wrong collection (#1244)"
+    )
+    assert got["documents"] and got["documents"][0], "empty compressed doc"
+    meta = got["metadatas"][0]
+    assert meta.get("wing") == "test"
+    assert "compression_ratio" in meta
 
 
 def test_cmd_repair_trailing_slash_does_not_recurse():