Function serializeSession

server/src/training-agent/state.ts:229–241

* Serialize a SessionState via the SDK's `structuredSerialize` (tagged * envelopes for Map/Date). Returns a JSON-safe Record.

(session: SessionState, key?: string)

 * envelopes for Map/Date). Returns a JSON-safe Record.
 */
function serializeSession(session: SessionState, key?: string): Record<string, unknown> {
  const persisted = {
    ...session,
    ...(key && { __sessionKey: key }),
    // `products` is deterministic from the catalog — dropped from persistence
    // so callers re-derive on the next request. Only `proposals` (session-
    // specific drafts from refine workflows) ride along.
    lastGetProductsContext: session.lastGetProductsContext?.proposals?.length
      ? { proposals: session.lastGetProductsContext.proposals }
      : undefined,
  };
  return structuredSerialize(persisted) as Record<string, unknown>;
}

/**
 * Hydrate a stored doc back into a SessionState.