CVE-2026-58484: Network-AI: Poisoned environment backup manifest allows arbitrary recursive deletion during backup pruning

Network-AI is a TypeScript/Node.js multi-agent orchestrator. Prior to version 5.12.2, EnvironmentManager.listBackups() reads each backup's manifest.json and trusts the manifest's path field. EnvironmentManager.pruneBackups() later passes that trusted entry.path directly to rmSync(entry.path, { recursive: true, force: true }). An attacker who can place or modify a manifest inside data/<env>/.backups/<name>/manifest.json can cause network-ai env backup prune --env <env> --keep <n> or any code path invoking pruneBackups() to recursively delete an arbitrary path accessible to the Network-AI process user. This is fixed in v5.12.2. pruneBackups() no longer passes entry.path from the on-disk manifest to rmSync. The deletion path is recomputed from a format-validated entry.backupId, and a dirname containment check confines deletion to exactly one level under the backups directory. A poisoned manifest (e.g. "path": "/") is now inert.