d62a586be4
The previous keyTrigger ('Work plan created → invoke Momus') was too
vague — Sisyphus would fire Momus on inline plans or todo lists,
causing Momus to REJECT because its input_extraction requires exactly
one .sisyphus/plans/*.md file path.
The updated trigger explicitly states:
- Momus should only be invoked when a plan file exists on disk
- The file path must be the sole prompt content
- Inline plans and todo lists should NOT trigger Momus