Pace 0.0.9

What's Changed

• feat(subagents): integrate Tintinweb lifecycle and session observation by @bubbleptr in #303
• feat(runtime): 按根会话隔离 Pi 进程 by @bubbleptr in #305
• feat(session): 将历史回放与首次执行解耦 by @bubbleptr in #306
• chore(release): prepare v0.0.9 with changelog by @bubbleptr in #307

Full Changelog: v0.0.8...v0.0.9