fix(moments): the tools import the delivery module, and the tool-list cache leaves the swept directory (milestone 458 step 4a, #4922)

Two guards caught 7865313:

- test_mcp_tool_processes reads every coroutine in a tool module's
  namespace as a tool, and a name-imported attach_moment_rules looked
  like one. All seven modules now call moment_delivery.attach_moment_rules,
  and the parity guard accepts the attribute form.
- The session-ledger convention: a file in a swept directory must be a
  .ids ledger. The tool-list cache describes the install, not the
  context, so it moves to its own directory, scribe-moment, where a
  compaction does not sweep it.

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

src/scribe/mcp/tools/notes.py

@@ -23,7 +23,7 @@ from scribe.services import systems as systems_svc
 from scribe.services import trash as trash_svc
 from scribe.services.note_usage import record_pulled
 from scribe.services.record_refs import refuse_guessed_ids
-from scribe.services.moment_delivery import attach_moment_rules
+from scribe.services import moment_delivery
 
 
 async def list_notes(
@@ -237,7 +237,7 @@ async def create_note(
     await systems_tools.attach_systems(uid, uid, data, note.id, project_id or None)
     await supersession_svc.attach_relations(uid, note.id, data, hint=True)
     data.update(dedup_svc.note_overlap_response(overlaps, "note"))
-    return await attach_moment_rules(uid, "create_note", {"project_id": project_id}, data)
+    return await moment_delivery.attach_moment_rules(uid, "create_note", {"project_id": project_id}, data)
 
 
 async def update_note(