fix(heartbeat): 心跳风暴回路 + lastHeartbeat 落库接线 + 心跳能力放开（A/B/C 入库） - #332
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从 feat/ui-optimize-0923 工作树抢救入库（此前从未进入任何提交，重构从 main 切分支会丢失）：
A. 风暴回路（agent-dirty-reconciler）：
- 新增 MAX_TRIGGER_HEARTBEAT_ATTEMPTS=3，连续 N 次 trigger-heartbeat 仍未脱离 stuck-busy 即停止自动兜底、升级 human-review（杜绝每 2 分钟一次的心跳风暴反馈回路）
- 仅当 agent 真正脱离 processing-like 才释放重试状态（修复宽限期内误释放导致的立即重触发）
- 附回归测试：stuck-working + 心跳宽限窗口场景，断言无 <RETRY_AFTER_MS 重复触发、连续 N 次升级 human-review、恢复 idle 后 key 释放
B. lastHeartbeat 落库接线：
- agent.ts 三处心跳落点（L8866/8912/9103）→ notifyStateChange()，心跳是存活证明
- stateChangeCallback payload 补 lastHeartbeat 字段（agent.ts/agent-manager.ts）
- cli start.ts stateChangeHandler → SqliteAgentRepo.updateLastHeartbeat
- sqlite-storage.ts 新增 updateLastHeartbeat（UPDATE agents SET last_heartbeat）
C. 心跳能力放开（reflex → converse）：
- capability-packs.ts scenarioToPack('heartbeat') → 'converse'（心跳与普通 session 同级工具集，边界由 HEARTBEAT.md + 间隔承担）
- agent.ts/context-engine.ts 移除 reflex 白名单锁死（去 getReflexAllowlist/HEARTBEAT_ALLOWED_TOOLS），提示改为 full session capability + 间隔调整需先征询人类
- capability-packs.test.ts 断言更新
D（clamp 5min–24h）已在 main（deep-sleep.ts/shared limits），不在本次提交。
测试：agent-dirty-reconciler 7/7 + capability-packs 10/10 通过（与首席科学家复核一致）
Fix C 将心跳从 reflex 白名单放开为 full session capability（与普通 session 同级）， 但 context-scenario-matrix / prompt-profiles 两处既有测试仍断言旧提示文本 （'reflex pack only' / 'Do **not** call 'task_create'），入库时未跑全量回归遗漏， 由 PR #332 CI（backend-coverage/quality）兜出。 按新期望行为更新断言： - 心跳提示应含 'full session capability'，不再含 'reflex pack only' / 禁 tool 集文本 - 其余约束（HEARTBEAT_OK、无 Self-Evolution、无显式任务创建鼓励）保持不变
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背景
心跳修复 A/B/C 此前只存在于 feat/ui-optimize-0923 工作树（从未进入任何提交），一旦后续重构 1-4 从 main 切分支即丢失。本次把它们从工作树抢救入库（首席科学家复核 tsk_805fb⬤ 时指出）。
内容
A. 风暴回路（agent-dirty-reconciler）
B. lastHeartbeat 落库接线
C. 心跳能力放开（reflex → converse）
D（clamp 5min–24h）已在 main，非本次范围。
验证
仓库