fix(session-persistence): repair persistence CI gates

- document the exported SqliteStore prefix/suffix loaders (verify-export-jsdoc)
- share createStoredEventRead from session-persistence so the standalone
  SQLite store stops duplicating the service helper (duplication gate)
- route replaceStored header upserts through writeRow (duplication gate)
- move replacement/conflict test SQL into closed test resources so the
  SQLite SQL resource boundary test passes

packages/session/session-persistence-sqlite/tests/resources/sql/create-temp-replace-trigger.sql

@@ -0,0 +1,5 @@
+CREATE TEMP TRIGGER fail_format_replace
+BEFORE UPDATE ON sessions
+BEGIN
+  SELECT RAISE(ABORT, 'simulated format replacement failure');
+END