docs(subagent): close review contract gaps

docs/architecture.md

@@ -59,7 +59,7 @@ The shipped loop drains work from prompt through checkpoint. Every pause is a se
 
 A **session** is an append-only event log. A **turn** drains queued input until the model stops asking for tools and no plugin requests continuation. A **step** is one model request plus the tool executions caused by that response. In the flow below ([sequence companion](agent-lifecycle.md)), quoted names are durable session events and event names are extension points.
 
-Startup resolves identity. No id mints `<config-id>-session-<uuid>`; `sessionId` resumes or creates; `resumeSessionId` requires history. Active failures emit `agent-loop/config-start-failed(sessionId, error)`, so front doors reject work; teardown stays silent.
+Startup resolves identity. No id mints `<config-id>-session-<uuid>`; `sessionId` resumes or creates; `resumeSessionId` requires history. Resume reconstructs durable session metadata before publication, so lineage, seed boundaries, and delegation depth survive restart. Active failures emit `agent-loop/config-start-failed(sessionId, error)`, so front doors reject work; teardown stays silent.
 
 ### Turn Flow
 

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