Note Minitest test command in SKILL.md Workflow 1 summary

Step 6 of the Workflow 1 summary showed `DEPRECATION_TRACKER=save
bundle exec rspec` only. Other surfaces already cover Minitest:
`setup-workflow.md` Step 6 has the substitution note;
`examples/basic-setup.md` Step 5 shows both RSpec and Minitest blocks
(commit 69e9bc0); `references/deprecation-tracking.md` documents
`track_minitest`. Mirror the `setup-workflow.md` Step 6 parenthetical
here so the SKILL.md summary doesn't imply RSpec is the only option.

Author: JuanVqz

dual-boot/SKILL.md

@@ -142,7 +142,7 @@ See `workflows/setup-workflow.md` for the complete step-by-step process.
 3. Add `next_rails` gem at the Gemfile root and run `bundle install`
 4. Run `next_rails --init` (only if `Gemfile.next` does NOT exist)
 5. Configure `DeprecationTracker` (ask upfront whether CI runs tests in parallel)
-6. Capture the deprecation inventory: `DEPRECATION_TRACKER=save bundle exec rspec`
+6. Capture the deprecation inventory: `DEPRECATION_TRACKER=save bundle exec rspec` (substitute the project's test command: `bin/rails test`, `bin/test`, `bundle exec parallel_rspec spec/`, etc.)
 7. Fix current-side deprecations unconditionally (Tier 1, no `NextRails.next?`)
 
 *Phase 2, dual-boot (the version hop):*