Improve sub-agent output clarity in migration documentation

[nhorton]

Summary

Updated migration documentation to enforce concise, minimal output from sub-agents during job cleanup and repair operations. This reduces noise and makes it easier to identify what actually changed.

Key Changes

• errata.md: Added guidance for the legacy skill folder removal sub-agent to output minimal text, reporting only what was removed or confirming nothing was found, without narrating the process or echoing commands
• fix_jobs.md:
  • Added a concise output instruction at the beginning of the sub-agent prompt
  • Updated the final reporting requirement to specify which checks passed with no changes and which changes were made (one line each), rather than generic "report what changes were made"

Implementation Details

These changes improve the clarity of sub-agent instructions by:

1. Explicitly requesting minimal, actionable output instead of verbose process narration
2. Preventing unnecessary echoing of commands or file contents
3. Standardizing the reporting format to be scannable and concise
4. Making it easier for users to quickly identify what migrations were performed

The changes apply to both the errata cleanup step and the job.yml repair step in the migration workflow.

https://claude.ai/code/session_017B8xtZAgmif6v86MbXXjwb