## Summary
- align the executor prompt regression with capability-aware workflow
creation guidance
- keep the no-creation-tool and per-tool cases covered by the adjacent
surface-specific test
## Test plan
- `pnpm --filter @fusion/core exec vitest run
src/__tests__/agent-prompts.test.ts --silent=passed-only --reporter=dot`
- `pnpm --filter @fusion/core typecheck`
- `pnpm check:changesets`
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Updated workflow guidance to prevent assigning workflows to the
current task while allowing workflow assignment for newly created or
delegated tasks.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Co-authored-by: gsxdsm <gsxdsm@users.noreply.github.com>