Codex Stop hook emits invalid JSON when workflow guidance is active

[obrunogonzaga]

Problem

When @dotcontext/cli@1.1.1 dispatches a Codex Stop hook while PREVC workflow guidance is active, stdout contains only hookSpecificOutput:

{
  "hookSpecificOutput": {
    "hookEventName": "Stop",
    "additionalContext": "dotcontext workflow guide: ..."
  }
}

Codex CLI 0.142.4 rejects that output with:

Stop hook (failed) error: hook returned invalid stop hook JSON output

Expected

Codex Stop output should use fields accepted by Codex for Stop hooks, e.g. continue plus systemMessage, while preserving hookSpecificOutput for Codex SessionStart if needed.

Example:

{
  "continue": true,
  "systemMessage": "dotcontext workflow guide: ..."
}

Repro Context

• @dotcontext/cli: 1.1.1
• Codex CLI: 0.142.4
• Hook source: codex
• Event: Stop
• Workflow: active PREVC guidance

Impact

The hook failure is noisy and makes Codex users disable or remove the Stop hook instead of receiving dotcontext workflow guidance.