feat(runtime-host): execute hosted agent graphs

[M4n5ter]

English

Summary

• Execute Agent Graph supervisor turns and durable child work through Runtime Host authority.
• Persist exact Graph wake and attempt identity so restart recovery resumes the intended supervisor checkpoint.
• Supersede stale or retired wake attempts terminally, preventing archived Sessions or outdated snapshots from re-entering execution.
• Preserve root and child tool ceilings while keeping live Graph work resident during Host drain and Session retirement.

Validation

• Full repository test suite: npm test --workspaces=false
• npm run lint
• npm run format:check
• Deterministic Runtime Host Graph execution through a real HTTP provider boundary
• Live end-to-end Graph execution with OpenRouter openrouter/free

Part of #1167. Related to #853.

中文

概要

• 由 Runtime Host 权威执行 Agent Graph 的 supervisor turn 与持久化子任务。
• 持久化精确的 Graph wake 与 attempt 身份，使重启恢复只续接目标 supervisor checkpoint。
• 将过期或已退役的 wake attempt 终结为 superseded，避免归档 Session 或旧快照重新进入执行。
• 保持 root/child 工具上限，并在 Host drain 与 Session retirement 期间正确维持存活 Graph 的 residency。

验证

• 完整仓库测试：npm test --workspaces=false
• npm run lint
• npm run format:check
• 通过真实 HTTP provider 边界执行确定性 Runtime Host Graph 场景
• 使用 OpenRouter openrouter/free 完成真实端到端 Graph 执行

属于 #1167 的一部分，关联 #853。