Function stableStringify

server/src/training-agent/state.ts:142–155

* Stable stringify for dirty-detection. * * Sort keys so object equality is positional-independent. Drop * `lastAccessedAt` — we update it on every read, so including it * would make every getSession() look dirty and defeat the * "only flush real mutations" invariant.

(value: unknown)

 * "only flush real mutations" invariant.
 */
function stableStringify(value: unknown): string {
  return JSON.stringify(value, (k, v) => {
    if (k === 'lastAccessedAt') return undefined;
    if (v && typeof v === 'object' && !Array.isArray(v)) {
      const sorted: Record<string, unknown> = {};
      for (const key of Object.keys(v as Record<string, unknown>).sort()) {
        if (key === 'lastAccessedAt') continue;
        sorted[key] = (v as Record<string, unknown>)[key];
      }
      return sorted;
    }
    return v;
  });
}

// ── Session shape helpers ────────────────────────────────────────