Add section on running both merge queues simultaneously

[pv72895]

Document how Trunk Merge Queue can run alongside GitHub Merge Queue during a gradual migration. Covers:

• No disruption to existing workflows
• Disabling comments during evaluation
• How Trunk handles external merges gracefully

Slack thread: https://trunk-io.slack.com/archives/C06973UPDU7/p1772817954315439

https://claude.ai/code/session_01XiND81kmk2wy4dMLxEYnJp

[trunk-staging-io]

❌ This pull request failed tests. It has been removed from the merge queue. PR #452 was used for testing. See more details here.

Failed Required Status	Conclusion
Trunk Code Quality Runner	Failure

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[claude]

Claude finished @pv72895's task in 1m 12s —— View job

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The new "Running Both Merge Queues Simultaneously" section is well-structured and clearly explains the concurrent migration approach. I left two inline comments with suggestions:

1. Heading case (line 27): The new heading uses Title Case while existing ### headings in the file use sentence case. Suggest changing to ### Running both merge queues simultaneously for consistency.

2. Duplicate content (line 35): The "Disable Comments During Evaluation" subsection duplicates the same setting and navigation path already described in the "Pre migration" section below. Worth consolidating to avoid confusion.

No blocking issues — the content is accurate and adds useful value.

[claude]

This subsection duplicates the content and navigation path already covered in the "Pre migration > Enable Trunk Merge for testing but with the automatic comments disabled" section below. Consider either removing this subsection and cross-referencing the pre-migration section, or consolidating it there to avoid confusion.

[github-actions]

/trunk merge

[github-actions]

Auto-approved: Claude code review passed.

[claude]

Claude finished @pv72895's task in 55s —— View job

---

Review complete

• Read changed file and diff
• Check for typos, grammar, and formatting issues
• Check documentation best practices
• Post review feedback

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The ### heading case issue from my previous review has been fixed. Good. The content is accurate and well-structured.

Two remaining issues:

1. #### subheading case inconsistency (lines 31, 35, 41)

The new section's #### subheadings use Title Case:

• #### No Disruption to Existing Workflows
• #### Disable Comments During Evaluation
• #### Trunk Handles External Merges Gracefully

But the existing #### subheadings in the file use sentence case:

• #### Enable Trunk Merge for testing but with the automatic comments disabled
• #### Make the switch
• #### Share the news

Fix this →

2. Duplicate content (line 35–39 vs line 58–62)

The "Disable Comments During Evaluation" subsection duplicates the same setting and navigation path already in "Pre migration > Enable Trunk Merge for testing but with the automatic comments disabled". Both sections describe the same toggle in the same location. Worth consolidating to avoid confusion — either remove it here and cross-reference the pre-migration section, or keep it here and streamline the pre-migration section.

No blocking issues — the content is accurate and adds useful value.

[github-actions]

/trunk merge

[github-actions]

Auto-approved: Claude code review passed.