fix(diary): rebuild closets on hash change + backfill legacy state

Address Copilot review on #925:

- Full closet rebuild whenever the content hash differs from prior
  state, not only on entry-count growth. Without this, an in-place
  edit (same entry count, different body) updated the drawer but
  left the closet/search index stale — defeats the verbatim guarantee
  at the search layer even if the drawer is correct.
- Legacy size-only skip path now records the computed content_hash
  back into state so subsequent runs use the strict hash check
  instead of remaining on the size-only path indefinitely.
- Test updates: typo direction in the regression test now matches the
  comment (typo "Teh" → fix "The"), assertion now also checks the
  closet collection reflects the edit, and a new test exercises the
  legacy-state backfill path.

mempalace/diary_ingest.py

@@ -133,10 +133,16 @@ def ingest_diaries(
                 if curr_hash == prev_hash:
                     continue
             elif curr_size == prev_size and prev_size > 0:
-                # Legacy state without content_hash: keep size-based skip so a
-                # post-upgrade run doesn't re-ingest every untouched diary.
+                # Legacy state without content_hash: keep size-based skip but
+                # backfill the hash so future runs use the strict check.
+                state[state_key] = {**prev_entry, "content_hash": curr_hash}
                 continue
 
+        # An in-place edit (same entry count, different content) means existing
+        # closets are stale. Force a full rebuild whenever the hash changes,
+        # not only on entry-count growth.
+        content_changed = prev_hash is not None and curr_hash != prev_hash
+
         now_iso = datetime.now(timezone.utc).isoformat()
         drawer_id = _diary_drawer_id(wing, date_str)
         entities = _extract_entities_for_metadata(text)
@@ -163,7 +169,8 @@ def ingest_diaries(
 
             entries = _split_entries(text)
             prev_entry_count = state.get(state_key, {}).get("entry_count", 0)
-            new_entries = entries if force else entries[prev_entry_count:]
+            full_rebuild = force or content_changed
+            new_entries = entries if full_rebuild else entries[prev_entry_count:]
 
             if new_entries:
                 all_lines = []
@@ -185,9 +192,9 @@ def ingest_diaries(
                     }
                     if entities:
                         closet_meta["entities"] = entities
-                    # On a force rebuild, wipe any leftover numbered closets
-                    # from a longer prior run before re-writing.
-                    if force:
+                    # On any full rebuild (force or detected content edit),
+                    # wipe leftover closets from a prior run before re-writing.
+                    if full_rebuild:
                         purge_file_closets(closets_col, source_file)
                     n = upsert_closet_lines(closets_col, closet_id_base, all_lines, closet_meta)
                     closets_created += n