test(hub-test): hub-server agent 包最后一个巨型测试文件 agent_test.go 按生产域拆入 7 个新域文件并 git rm——67 Test 逐字搬移（dispatch 19 / trigger-contract 12 / cancel 2 / edge-callback 19 / final-message 10 / service 5），共享夹具与 mock 收进 helpers_test.go，四路守恒 diff rc=0，golangci-lint 0 issues

[DeliciousBuding]

Co-authored-by: Cursor cursor@vectorcontrol.tech

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[DeliciousBuding]

round-73 主机复核（这两个分支自 round-72 起 committed-but-never-PR'd，落地前重测过）

这两个 PR 是 round-72 已经完成、但一直没开 PR 的纯搬家工作。round-73 的收尾原则是「不许留悬空分支」，所以在落地前把它们重新拉到当前 master 上复核了一遍，而不是直接推：

• rebase 到当前 master 干净（各自落后 12 / 13 个 commit，0 冲突）；
• 本地 61 项 validate PASS=61 FAIL=0 SKIP(merge-ref)=1（两个分支各跑一遍）；
• 测试守恒对上了 round-71 记录的基线（这是本仓拆/搬测试文件的验收口径）：
  • edge-server/internal/store：go test -count=1 ok，-v 的 === RUN = 306（基线 306）；
  • hub-server/internal/service/agent：go test -count=1 ok，-v 的 === RUN = 247（基线 247）；
• 提交身份 DeliciousBuding <DeliciousBuding@users.noreply.github.com>，Co-authored-by trailer 与 master 上既有先例一致（master 近 200 个 commit 里已有 Cursor / Claude Code / Codex 三种）。

为什么现在才落地：round-73 的优先级是 Correctness → Contract/Decision → Developer feedback → Measured performance → Cleanup，这两发属最后一档，所以排在 #2298/#2299/#2301/#2302/#2305/#2306/#2307/#2308/#2309/#2310 之后。核心目标收口后才动它们；再拖下去只会让 rebase 成本继续涨、把已经付过的守恒验证成本烂在本地分支里。

0 行 src 改动，两个 PR 的写集不重叠（edge-server/internal/store vs hub-server/internal/service/agent）。