fix: add missing iter_all_metadatas and propagate EmbeddingModelMismatchError

- Add iter_all_metadatas() to palace.py (paginated metadata reads, needed
  by mismatch detection and re-mine but missing after cherry-pick)
- Fix searcher.py: EmbeddingModelMismatchError was caught by generic
  except clauses, showing "No palace found" instead of the real error.
  Now re-raises properly in both search() and search_memories().

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: kAI Shtefan

mempalace/palace.py

@@ -92,6 +92,27 @@ def get_collection(palace_path: str, collection_name: str = "mempalace_drawers",
         )
 
 
+def iter_all_metadatas(collection, where=None, page_size: int = 10000):
+    """Yield every metadata entry in the collection, paginating past the page cap.
+
+    ChromaDB's ``collection.get()`` enforces a per-call limit, so a single fetch
+    silently truncates large palaces. This walks the collection in pages so
+    callers see every drawer — with or without a ``where`` filter.
+    """
+    offset = 0
+    while True:
+        kwargs = {"include": ["metadatas"], "limit": page_size, "offset": offset}
+        if where is not None:
+            kwargs["where"] = where
+        page = collection.get(**kwargs)
+        metas = page.get("metadatas") or []
+        if not metas:
+            break
+        for m in metas:
+            yield m
+        offset += len(metas)
+
+
 def file_already_mined(collection, source_file: str, check_mtime: bool = False) -> bool:
     """Check if a file has already been filed in the palace.
 

mempalace/searcher.py

@@ -9,6 +9,7 @@
 import logging
 from pathlib import Path
 
+from .config import EmbeddingModelMismatchError
 from .palace import get_collection as _palace_get_collection
 
 logger = logging.getLogger("mempalace_mcp")
@@ -25,6 +26,8 @@ def search(query: str, palace_path: str, wing: str = None, room: str = None, n_r
     """
     try:
         col = _palace_get_collection(palace_path)
+    except EmbeddingModelMismatchError:
+        raise
     except Exception:
         print(f"\n  No palace found at {palace_path}")
         print("  Run: mempalace init <dir> then mempalace mine <dir>")
@@ -98,6 +101,8 @@ def search_memories(
     """
     try:
         col = _palace_get_collection(palace_path)
+    except EmbeddingModelMismatchError:
+        raise
     except Exception as e:
         logger.error("No palace found at %s: %s", palace_path, e)
         return {