Save, edit, remove or clear a personal memory [write]

Requires write scope and unrestricted owner-facing credentials in your personal universe. Read GET /memory first and copy its version exactly into expectedVersion, even when entries is empty. The sample uses null for a store before its first write; replace it with the returned version for an existing document. Stale writes return 409; reload and resolve the change instead of overwriting. Entries are limited to 2048 UTF-8 bytes and the complete recall context to 4000 characters. A state-changing clear advances the version; a no-op on an existing document retains it. Clear preserves allocated indexes.