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 automated pull-request code analysis to use the revision provided by the standard checkout behavior instead of explicitly checking out a parent revision. This affects the revision analyzed by the workflow; no application features or user-facing behavior changed.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 0cc7df51-7108-4c05-9b04-99ab4ef1ffbf

📥 Commits

Reviewing files that changed from the base of the PR and between 8a07f3e and 499e6e4.

📒 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 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The CodeQL workflow removes its explicit fetch depth and pull-request-only checkout of HEAD^2. Pull requests now use the revision selected by the checkout action’s default behavior.

Changes

CodeQL workflow

Layer / File(s)	Summary
Use default checkout revision .github/workflows/codeql-analysis.yml	The workflow no longer sets a fetch depth of 2 or checks out HEAD^2 for pull requests.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 499e6

The workflow now analyzes the pull-request merge commit as intended. No concrete merge-blocking risk was identified; it is ready to merge subject to normal checks.

🚥 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 the code,
No second parent on the road.
The workflow takes its default way,
And hops along through analysis day.
A quiet change, then off I go!}

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

[Copilot]

Copilot review overview

🟢 Approval recommended

The focused workflow change correctly removes obsolete checkout customization without affecting CodeQL initialization or analysis.

Review effort: Balanced
Findings: None

What changed in this PR

Updates CodeQL pull-request analysis to use the default merge commit checkout and removes the obsolete warning.

Changes:

• Removed the custom shallow fetch depth.
• Removed manual checkout of the pull request’s second parent.

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

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