docs: add archive notice, superseded by openclaw-tunnel

fix: Node.js 版本要求 18→22（代码用了 node:sqlite）

升级 Docker 镜像版本 2026.3.7 → 2026.3.8

feat: callback 解耦 Discord + smoke test 全面增强 + CI workflow

fix: remove dead RUNNER_SESSION_RETENTION_MS config

fix: remove duplicate session cleanup timer from runner

fix: remove DISCORD_* env var fallbacks, update docs to match code

升级全部 Docker bot 镜像 2026.3.2 → 2026.3.7

Clarify runner cache and add smoke test

Refine Docker-first product positioning

Persist active session state

Persist task queue in SQLite

Add event ops and reconcile audit

Persist runner events in SQLite

Add task event API and reconciler lifecycle