### S0-A  sha=6f2d6c63e3f252651c0221c8a3dcf9d9f950dbbd  status: 
$ node apps/server/scripts/timeline-follow-fixture.ts print | tee fixture.json | sha256sum
c26f312ce0ea3f4c3fd33bf5e9b431de178535a49fe93318a9cdd51d35f35b87  -
$ node apps/server/scripts/timeline-follow-fixture.ts provider /tmp/ev-22788/run/bar-A
{
  "operation": "create",
  "instanceId": "timeline_fixture",
  "instance": {
    "driver": "acpRegistry",
    "displayName": "Timeline fixture",
    "enabled": true,
    "config": {
      "source": "local",
      "commandPath": "/home/ubuntu/.local/share/vite-plus/js_runtime/node/26.12.1/bin/node",
      "commandArgs": [
        "/tmp/ev-22788/run/A/apps/server/scripts/acp-mock-agent.ts"
      ]
    },
    "environment": [
      {
        "name": "T3_ACP_TIMELINE_FIXTURE_DIRECTORY",
        "value": "/tmp/ev-22788/run/bar-A",
        "sensitive": false
      }
    ]
  }
}
$ node apps/server/src/bin.ts project add --base-dir $R/home-A $R/ws-A
Added project c0175c37-7466-493a-8553-98e050c8b879 (ws-A) at /tmp/ev-22788/run/ws-A.
$ node apps/server/scripts/timeline-follow-fixture.ts seed $R/home-A $R/ws-A timeline_fixture short
{"threadId":"mcp:f4ee64ff-c46c-41bd-830a-c74a7e194a39","projectId":"c0175c37-7466-493a-8553-98e050c8b879","runId":"run:thread:mcp%3Af4ee64ff-c46c-41bd-830a-c74a7e194a39:ordinal:1"}
exit=0
## companion short barrier /tmp/ev-22788/run/bar-A/1362734-1 (mock pid 1362734; alive: node-MainThread /home/ubuntu/.local/share/vite-plus/js_runtime/node/26.12.1/bin/node /tmp/ev-22788/run/A/apps/server/scr)
waiting.json before entry: {"kind":"short","phase":"entry","sessionId":"timeline-fixture-1362734"}
done files before: 
after release entry: entry.done entry.release waiting.json 
waiting.json before tool-start: {"kind":"short","phase":"tool-start","sessionId":"timeline-fixture-1362734"}
done files before: entry.done 
after release tool-start: entry.done entry.release tool-start.done tool-start.release waiting.json 
waiting.json before tool-finish: {"kind":"short","phase":"tool-finish","sessionId":"timeline-fixture-1362734"}
done files before: entry.done tool-start.done 
after release tool-finish: entry.done entry.release tool-finish.done tool-finish.release tool-start.done tool-start.release waiting.json 
waiting.json before prose: {"kind":"short","phase":"prose","sessionId":"timeline-fixture-1362734"}
done files before: entry.done tool-finish.done tool-start.done 
after release prose: entry.done entry.release prose.done prose.release tool-finish.done tool-finish.release tool-start.done tool-start.release waiting.json 
waiting.json before resumed: {"kind":"short","phase":"resumed","sessionId":"timeline-fixture-1362734"}
done files before: entry.done prose.done tool-finish.done tool-start.done 
after release resumed: entry.done entry.release prose.done prose.release resumed.done resumed.release tool-finish.done tool-finish.release tool-start.done tool-start.release waiting.json