## start two runs
POST /runs -> 303
POST /runs -> 303
## state
[
    {
        "id": "run-b085b6",
        "status": "paused",
        "pending": [
            {
                "question": "Approve this action?",
                "action": "refund order #42"
            }
        ],
        "action": "refund order #42",
        "result": null
    },
    {
        "id": "run-2d5b84",
        "status": "paused",
        "pending": [
            {
                "question": "Approve this action?",
                "action": "delete user 7"
            }
        ],
        "action": "delete user 7",
        "result": null
    }
]
decision must be approve or reject  invalid decision value -> 400
## HTML has Approve buttons: 2
approve run-b085b6 -> 303
reject run-2d5b84 -> 303
run is not paused (already decided)  double-decide run-b085b6 -> 409
not found  unknown run id -> 404
## final state
[
    {
        "id": "run-b085b6",
        "status": "done",
        "pending": [],
        "action": "refund order #42",
        "result": "EXECUTED: refund order #42"
    },
    {
        "id": "run-2d5b84",
        "status": "done",
        "pending": [],
        "action": "delete user 7",
        "result": "REJECTED: not allowed"
    }
]
## HTML after:
<form method=post action=/runs><input name=action value="refund order #42 ($19.99)" size=40><button>Start run</button></form><hr><div><b>run-2d5b84</b> DONE: REJECTED: not allowed</div>
<div><b>run-b085b6</b> DONE: EXECUTED: refund order #42</div>
## server log
serving on http://127.0.0.1:8765
  [http] "GET / HTTP/1.1" 200 -
  [http] "POST /runs HTTP/1.1" 303 -
  [http] "POST /runs HTTP/1.1" 303 -
  [http] "GET /api/runs HTTP/1.1" 200 -
  [http] "GET /api/runs HTTP/1.1" 200 -
  [http] "POST /runs/run-b085b6/decision HTTP/1.1" 400 -
  [http] "GET / HTTP/1.1" 200 -
  [http] "POST /runs/run-b085b6/decision HTTP/1.1" 303 -
  [http] "POST /runs/run-2d5b84/decision HTTP/1.1" 303 -
  [http] "POST /runs/run-b085b6/decision HTTP/1.1" 409 -
  [http] "POST /runs/nope/decision HTTP/1.1" 404 -
  [http] "GET /api/runs HTTP/1.1" 200 -
  [http] "GET / HTTP/1.1" 200 -
