fix(storage): 强化外部图片导入与 Skill 异常引导

.agents/skills/upload-delivery-desk-work/SKILL.md

@@ -143,6 +143,22 @@ Report group, project, work ID, `externalId`, created round number, title, image
 
 If the result is `state_unknown`, do not rerun `apply`. Run `inspect-work` and compare server state to the plan. If the result still cannot be proven, ask the operator before any retry.
 
+## Failure actions
+
+On failure, the script exits with code `1` and writes one JSON object to stderr:
+
+```json
+{"success": false, "action": "revise", "error": "...", "next_step": "..."}
+```
+
+Follow `action` exactly:
+
+- `retry`: Retry only the same read-only command, with the same target and parameters, after completing `next_step`. Never reinterpret this as permission to retry `apply`.
+- `revise`: Change only the invalid input identified by `error`, regenerate the plan, show the full changed plan, and obtain a new confirmation code before `apply`.
+- `ask_operator`: Stop. Show the exact target, `error`, and `next_step` to the operator or administrator. Do not change targets, permissions, project state, or credentials yourself.
+
+If output is `state_unknown`, it is always `ask_operator`: inspect current server state first and never automatically repeat the write.
+
 ## API troubleshooting
 
 Read [references/api-contract.md](references/api-contract.md) before calling an endpoint directly, interpreting an error, or changing this skill for a new API version.