fix(embeddings): embed in the service, so every caller gets it (#2056)

A note or task created through MCP was not semantically searchable until the
next restart's backfill ran. Embedding fired at the five REST route handlers
and nowhere else; the MCP tools call the service directly, so they skipped it.

The shape of this bug is the reason to care: it is invisible on an instance
that redeploys constantly (this one does, per rule 46) and permanent on one
that doesn't. Rule 115 — the product has to stand up for the install that
restarts twice a year, not just for the one that restarts hourly.

Moved to services/notes.embed_note(), called from create_note and update_note,
and deleted from all five routes. Every caller — REST, MCP, recurrence,
snippets — now gets it by construction rather than by remembering.

Two things fall out of having one implementation instead of six:

- It uses note.user_id, the OWNER. The routes were inconsistent: some passed
  the caller's uid, some the owner's. On a shared record the caller's id mints
  a second embedding row that nothing reads.
- services/snippets.py's _embed_snippet existed only because snippets are
  created via MCP and the routes couldn't cover them. Every one of its four
  call sites goes through notes_svc, so the helper and its four calls are gone,
  along with the eight test patches that existed to neutralise it.

RuntimeError (no running loop — unit tests, scripts) and any indexing failure
are both swallowed: a write that succeeded must not be failed by its index.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UaYUaouG9jjhATyuxCKrQs

tests/test_services_notes.py

@@ -0,0 +1,64 @@
+"""services/notes.py — the inline embedding moved here from the routes (#2056).
+
+Why it moved: embedding was triggered at each REST route and nowhere else, so a
+record created through MCP stayed out of semantic search and auto-inject until
+the next restart's backfill. Putting it in the service means every caller — REST,
+MCP, recurrence, snippets — gets it by construction rather than by remembering.
+
+These test the helper directly. The point of the change is that there is now ONE
+place to test.
+"""
+from scribe.services import notes as notes_svc
+
+# --- inline embedding (#2056) -----------------------------------------------
+
+def test_embed_note_uses_the_OWNER_not_the_caller():
+    """LOAD-BEARING for shared records. An embedding belongs to the record; a
+    collaborator editing a shared note must refresh the owner's row rather than
+    mint a second one under their own id. The routes this replaced passed the
+    caller's uid on one path and the owner's on another — exactly the kind of
+    inconsistency that moving it to one place removes."""
+    from unittest.mock import MagicMock, patch
+
+    note = MagicMock(id=5, user_id=42, title="T", body="B")
+    with patch("scribe.services.embeddings.upsert_note_embedding") as upsert, \
+         patch("asyncio.create_task") as create_task:
+        notes_svc.embed_note(note)
+
+    assert create_task.called
+    upsert.assert_called_once()
+    assert upsert.call_args.args[0] == 5
+    assert upsert.call_args.args[1] == 42          # owner, never the caller
+    assert upsert.call_args.args[2] == "T\nB"
+
+
+def test_embed_note_skips_a_record_with_no_text():
+    """An empty embedding is worse than none — it is a row that matches nothing
+    and hides the fact that the record was never indexed."""
+    from unittest.mock import MagicMock, patch
+
+    note = MagicMock(id=5, user_id=42, title="", body="")
+    with patch("asyncio.create_task") as create_task:
+        notes_svc.embed_note(note)
+    assert not create_task.called
+
+
+def test_embed_note_without_a_running_loop_is_not_an_error():
+    """Unit tests and scripts call create_note with no event loop. That must be
+    an ordinary case: a write that succeeded cannot be failed by its index
+    refresh."""
+    from unittest.mock import MagicMock, patch
+
+    note = MagicMock(id=5, user_id=42, title="T", body="B")
+    with patch("asyncio.create_task", side_effect=RuntimeError("no running loop")):
+        notes_svc.embed_note(note)          # must not raise
+
+
+def test_embed_note_swallows_an_indexing_failure():
+    """Same reason, wider net: the embedding model being unavailable must not
+    turn a successful save into a 500."""
+    from unittest.mock import MagicMock, patch
+
+    note = MagicMock(id=5, user_id=42, title="T", body="B")
+    with patch("asyncio.create_task", side_effect=ValueError("model gone")):
+        notes_svc.embed_note(note)          # must not raise