docs(subagent): close review contract gaps

docs/cordis-catalog/services.md

@@ -718,9 +718,9 @@ Persistence is intentionally not implemented here — persistence plugins subscr
  * Create a session owned by the calling fiber: disposing that fiber stops
  * event notification and removes the session from the store. `options.seed`
  * populates the session with a copy of those events (replay/fork);
- * `options.meta` attaches creation metadata (validated absolute `cwd`,
- * `parentSession` lineage) as the immutable {@link SessionHeader} (the store
- * fills `version`/`id`/`createdAt`).
+ * `options.meta` attaches creation metadata (validated absolute `cwd`, seed
+ * and parent lineage, and delegation depth) as the immutable
+ * {@link SessionHeader} (the store fills `version`/`id`/`createdAt`).
  *
  * For an agent whose session must be torn down IN ORDER with its loop (so the
  * loop's final flush is captured before the store attachment ends), do NOT use this