STF-1604: Analyze the merge commit in CodeQL on pull requests

[oschwald]

The CodeQL init step warns on every run:

1 issue was detected with this workflow: git checkout HEAD^2 is no longer necessary. Please remove this step as Code Scanning recommends analyzing the merge commit for best results.

This removes the git checkout HEAD^2 step and the fetch-depth: 2 it needed. On pull requests, CodeQL now analyzes the merge commit that actions/checkout fetches by default. The init, autobuild, and analyze steps are unchanged.

This PR's own CodeQL run should show no warning in the "Initialize CodeQL" step.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated pull request code analysis to use the default checkout revision and fetch depth.

[coderabbitai]

Navigate logical layers of code changes, visualize relationships, and explore their blast radius.

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 4c466ab4-b393-41e3-982f-bdc83402d469

📥 Commits

Reviewing files that changed from the base of the PR and between 276926d and 1944385.

📒 Files selected for processing (1)

• .github/workflows/codeql-analysis.yml

💤 Files with no reviewable changes (1)

• .github/workflows/codeql-analysis.yml

Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 1 remain after this review.

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📝 Walkthrough

Walkthrough

The CodeQL workflow removes the checkout fetch-depth override and the pull-request-only step that checked out HEAD^2. Pull-request runs now use the checkout action’s default ref and fetch depth.

Changes

CodeQL checkout

Layer / File(s)	Summary
Checkout configuration .github/workflows/codeql-analysis.yml	The workflow removes fetch-depth: 2 and the pull-request-only git checkout HEAD^2 step.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 19443

CodeQL now analyzes the pull-request merge result using the default checkout behavior. No actionable merge-blocking risk was identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: CodeQL will analyze the merge commit on pull requests.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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_{A rabbit checks out code with care
The default ref is waiting there
No extra depth, no second head
The workflow follows paths ahead
Then hops away to nibble greens}

_{Comment @coderabbitai help to get the list of available commands.}

[Copilot]

Copilot review overview

🟢 Approval recommended

The focused workflow change correctly removes the obsolete checkout behavior without affecting other CodeQL steps.

Review effort: Balanced
Findings: None

What changed in this PR

Updates CodeQL pull-request analysis to scan GitHub’s default merge commit.

Changes:

• Removes the custom PR-head checkout.
• Restores the default shallow checkout depth.

File	Description
.github/​workflows/​codeql-analysis.yml	Uses the default checkout revision for CodeQL analysis.

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