The verification-fix agent prompt previously forbade modifying files
unrelated to the failure, which blocked the natural fix when
deterministic merge verification failed because of stale/missing
plugin `dist/` outputs in sibling workspace packages (e.g.
`Failed to resolve import "./cli-spawn.js"` from
`fusion-plugin-hermes-runtime/dist`).
- Add explicit guidance to detect stale-artifact failure signatures
and rebuild the affected package(s) before editing source.
- Allow the agent to fix pre-existing breakage on the base branch,
preferring the smallest change that makes verification green.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>