docs: SessionStore Protocol points to delete_session_via_store, not delete_session

delete_session() is the pre-existing sync disk-path helper that os.remove()s
the local JSONL and never touches a SessionStore. The async store-backed
counterpart that actually calls store.delete() is delete_session_via_store().
A user following the old wording would call delete_session() expecting their
adapter's data to be removed and only the local file would go.

Author: qing-ant

src/claude_agent_sdk/types.py

@@ -1173,8 +1173,9 @@ class SessionStore(Protocol):
     The subprocess still writes to local disk (set ``CLAUDE_CONFIG_DIR=/tmp``
     for an ephemeral local copy); the adapter receives a secondary copy.
 
-    The SDK never deletes from your store unless you call ``delete_session()``
-    with :meth:`delete` implemented. Retention is the adapter's responsibility —
+    The SDK never deletes from your store unless you call
+    ``delete_session_via_store()`` with :meth:`delete` implemented. Retention is
+    the adapter's responsibility —
     implement TTL, object-storage lifecycle policies, or scheduled cleanup
     according to your compliance requirements (e.g. ZDR/HIPAA retention
     windows). Local-disk transcripts under ``CLAUDE_CONFIG_DIR`` are swept by