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 submodules: true setting stays. 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 the CodeQL workflow to use the default checkout behavior for pull requests.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: bc9a99c1-268e-43e8-89c8-706f0eeab573

📥 Commits

Reviewing files that changed from the base of the PR and between 1a33461 and 6c9a7a1.

📒 Files selected for processing (1)

• .github/workflows/codeql-analysis.yml

💤 Files with no reviewable changes (1)

• .github/workflows/codeql-analysis.yml

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📝 Walkthrough

Walkthrough

The CodeQL workflow removes the fetch-depth limit and the pull-request-only checkout of HEAD^2. Submodule checkout remains enabled, and credential persistence remains disabled.

Changes

CodeQL checkout

Layer / File(s)	Summary
Update checkout behavior .github/workflows/codeql-analysis.yml	The checkout step no longer sets fetch-depth: 2. The workflow also removes the pull-request-only git checkout HEAD^2 step. Submodule checkout and disabled credential persistence remain.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~5 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 6c9a7

This change only adjusts how the CodeQL workflow checks out code, so that pull-request runs analyze the merge commit and stop emitting the warning. It does not affect production behavior, and no merge-blocking risk was found.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: CodeQL will analyze the merge commit for pull requests.
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.

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_{A rabbit checks the workflow trail,
No shallow fetch will set the scale.
The submodules stay in view,
Credentials remain tucked from view.
I twitch my nose and hop away!}

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