Skill follow-up: monorepo-orchestration-setup

## Summary
Address the follow-up actions for the monorepo-orchestration-setup skill as identified in the skills review.

## Acceptance Criteria
- [ ] Add evidence examples for `nx graph`/`turbo` outputs and baseline performance metrics.

## Scope
- Applies to `skills/monorepo-orchestration-setup/`
- Derived from skills-review.md (commit 9c59dbc)

## Parent
- Refs: #297
