feat(狀態回報): 收尾寫一筆 skill-end 事件

現行紀錄只記「被叫用」，沒有成敗也沒有結束碼。跑完整輪的技能與開場就
中止的技能，在紀錄裡長得一模一樣。

start 由技能用量 hook 順手發，不必改技能文件。end 只能由技能自己在收尾
步驟寫——hook 接在技能工具呼叫上，而實際工作發生在之後的模型輪次，它在
原理上看不到成敗。有 start 沒有配對的 end，就是那一輪中止了。

status 五選一，每支技能各自寫明什麼情況選哪一個。找不到回報腳本就安靜
跳過，回報失敗一律不改變技能自己的結論。

skills/delegate/SKILL.md

@@ -97,6 +97,22 @@ Detection and tag filtering are decided in code, not in prose: `jsc-cli/tools/de
 
    Done when the CLI, the model, the requirement and the per-criterion verdicts are all in the report, and every failure recorded in step 6 appears in the failure section.
 
+8. **Record how the run ended.** This is the last thing this skill does, and it runs on every path out of the skill, the ones that stop at step 1 or step 3 included. Call
+
+   `jsc-hooks/tools/report-status.sh skill-end jsc-cli:delegate {status} {exit code} [detail]`
+
+   `{exit code}` is the exit code of whatever decided the outcome — the subagent's own status, or the `detect-clis.sh` or `model-tags.sh` call that ruled the run — and `0` when nothing failed. `{detail}` is one short line, no more than 200 characters: the target CLI and the model id fit there, the subagent's output does not. **If the script is not on this machine, skip this step in silence and finish the run as it stood** — missing infrastructure is not a failure, and a reporting call may never change what this skill returns or reports.
+
+   | status | When this skill uses it |
+   | --- | --- |
+   | `ok` | The subagent exited 0, its output held one `result` and one `summary` line, every acceptance criterion came back `pass`, and every `wrote` path sat inside the write scope |
+   | `blocked` | The capability gate stopped the delegation before it started, so no subagent ran: every candidate model returned `FAIL` or `UNKNOWN-MODEL` from `model-tags.sh gate`, `detect-clis.sh` exited 0 with no row, the CLI the user named is not on this machine, or the target CLI has no model row and no forced model |
+   | `failed` | The delegation ran and broke: the subagent exited non-zero, its exit status could not be obtained at all, its output was missing the `result` or `summary` line, a criterion came back `fail`, or a `wrote` path landed outside the write scope. `detect-clis.sh` or `list-models.sh` exiting non-zero sits here too |
+   | `degraded` | The subagent returned `result needs-input`: part of the goal is done and the rest waits on the user, so the report has a 需要使用者補充 section that is not empty. The delegation happened, the goal did not close |
+   | `aborted` | The premise did not hold, so the skill stopped on its own: step 1 could give the goal no pass-or-fail acceptance criterion, or the request carried two or more independent goals and has to be split. Also used when the user stops the run before step 5 spawns the subagent |
+
+   Done when exactly one `skill-end` line was recorded for this run, or the script was absent and the run finished without it.
+
 ## Do not use this skill
 
 - Do not use it for model inventory. That is `/jsc-cli:models`.