docs(flaky-tests): note automatic PR number detection on CircleCI

[samgutentag]

Summary

• Documents that the Trunk Analytics CLI automatically detects the pull request number from CircleCI environment variables
• No extra configuration is needed for PR-level test attribution on CircleCI

Source

• trunk2 PR: https://github.com/trunk-io/trunk2/pull/3781

Test plan

• Preview in GitBook

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Generated by Claude Code

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[claude]

Claude finished @samgutentag's task in 36s —— View job

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Review

• Gather context and read changed files
• Review documentation changes

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The change is a clean, well-placed addition. Here's my assessment:

What the PR does: Adds an info hint block to flaky-tests/get-started/ci-providers/circleci.md (lines 44–46) noting that the Trunk Analytics CLI auto-detects PR context from CircleCI environment variables, so no extra configuration is needed.

Placement: ✅ Correctly positioned right after the "Upload Test Results" step instructions — exactly where a user might wonder if additional PR configuration is needed.

Grammar & spelling: ✅ No errors found.

Formatting: ✅ Uses the GitBook {% hint style="info" %} syntax consistently with the rest of the file.

Minor observation (non-blocking): The phrase "detects PR context from CircleCI environment variables, including the pull request number" is slightly redundant — "PR context" already implies PR number. A tighter alternative could be:

The Trunk Analytics CLI automatically detects the pull request number from CircleCI environment variables. No additional configuration is needed to associate test uploads with the correct PR in Trunk.

But the current wording is perfectly readable and not incorrect, so this is just a style note.

Result: ✅ Approved — no blocking issues.

[github-actions]

Auto-approved: Claude code review passed.