fix(family): the repeat trigger compares a record only with its own kind - a snippet with snippets, a note with notes (#5130)

A dated release log (a note) matched a signed-APK CI snippet at 0.83 on
shared release vocabulary and was opened as a family candidate, then came
back as a precedent. One chunk of a long narrative scores like the shape
it mentions, so a cross-kind score does not mean "the same thing made
twice". The search is filtered to the new record's kind and the loop
checks it too. Code built from an idea written elsewhere still reaches the
engine through the citation trigger and the shape ledger.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/scribe/services/family.py

@@ -119,7 +119,15 @@ _LINEAGE = re.compile(
 _LINEAGE_WINDOW = 80
 
 # Note kinds the repeat trigger compares: recorded knowledge and shapes, not
-# the to-do list.
+# the to-do list — and each only against its own kind (#5130). A repeat is the
+# same KIND of thing made twice: two shapes built, or two ideas written down.
+# Across kinds the score stops meaning that. One chunk of a long narrative
+# note that mentions a shape's vocabulary scores like the shape itself: a
+# dated release log matched a signed-APK CI snippet at 0.83, above this
+# trigger's floor, and opened the log as a candidate. The cross-kind relation
+# that IS real — code built from an idea written elsewhere — has its own
+# routes: the citation trigger when the lineage is named, and the shape ledger
+# once the idea is canon.
 _REPEAT_KINDS = ("snippet", "note")
 
 MEMBER_STATES = ("declared", "detected")
@@ -928,13 +936,15 @@ async def citation_trigger(user_id: int, note) -> str | None:
 
 
 async def repeat_trigger(user_id: int, note) -> str | None:
-    """A new record whose meaning repeats a record in ANOTHER project that
-    shares a platform with this one opens an evaluation of the earlier record.
-    Silent when the projects share no platform, below the threshold, or when
-    the project has no platforms yet."""
+    """A new record whose meaning repeats a record OF THE SAME KIND in another
+    project that shares a platform with this one opens an evaluation of the
+    earlier record. Silent when the projects share no platform, below the
+    threshold, when the project has no platforms yet, or when the only match
+    is a different kind (`_REPEAT_KINDS` says why)."""
     from scribe.services.embeddings import embedding_text, semantic_search_notes
 
-    if not getattr(note, "project_id", None) or note.is_task:
+    kind = getattr(note, "note_type", None) or "note"
+    if not getattr(note, "project_id", None) or note.is_task or kind not in _REPEAT_KINDS:
         return None
     async with async_session() as session:
         mine = await _member_platform_ids(session, note.project_id)
@@ -942,12 +952,14 @@ async def repeat_trigger(user_id: int, note) -> str | None:
         return None
     hits = await semantic_search_notes(
         user_id, embedding_text(note.title, note.body), exclude_ids={note.id},
-        limit=8, threshold=REPEAT_THRESHOLD, scope="read", note_type=_REPEAT_KINDS,
+        limit=8, threshold=REPEAT_THRESHOLD, scope="read", note_type=kind,
         is_task=False, demote_superseded=False,
     )
     for score, other in hits:
         if not other.project_id or other.project_id == note.project_id:
             continue
+        if (other.note_type or "note") != kind:
+            continue
         async with async_session() as session:
             shared = mine & await _member_platform_ids(session, other.project_id)
         if not shared or not await access.can_write_note(user_id, other.id):