[ChatGPT Connector compat] Fetch memory by ID.
Exists to satisfy ChatGPT Deep Research's required `search`/`fetch` tool
contract. Native MCP clients should fetch via `recall` + memory_id, or
use the API's GET /memories/{id} endpoint directly.
Returns a single memory with citation support (id, title, url, text fields).
Args:
id: Memory UUID to fetch
ctx: MCP context
Returns:
Dict with id, title, url, text, metadata fields
Connector