build: fix markdown_equations push failure when PR branch exists

[Planeshifter]

Resolves N/A — automated CI fix; no tracking issue.

Description

What is the purpose of this pull request?

This pull request:

• fixes a persistent failure in the markdown_equations scheduled workflow where peter-evans/create-pull-request produces error: failed to push some refs when the markdown-insert-equations branch already exists on the remote.

Root cause. The workflow's shallow clone (fetch-depth: 100) only fetches the develop branch. The markdown-insert-equations branch is never fetched, so no local tracking reference exists for it. When peter-evans internally calls git push --force-with-lease origin markdown-insert-equations, git cannot verify the expected remote state against a missing tracking ref and rejects the push.

Fix. A single git fetch origin markdown-insert-equations 2>/dev/null || true is added at the top of the "Delete remote PR branch" step, immediately before the API delete call. This establishes the tracking reference before peter-evans runs. Two outcomes:

1. Delete succeeds — peter-evans creates the branch from scratch; no force-with-lease concern.
2. Delete fails (permissions, race) — the tracking reference is present, force-with-lease can verify the remote state, and the push succeeds.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• None.

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

The workflow has failed on 14 of 15 runs in the past 30 days. The one success (2026-06-19) was likely a run where the markdown-insert-equations branch did not yet exist at push time.

The git commit calls in the "Generate SVG equations" and "Update equation elements" steps are intentionally preserved: the remark-img-equations-src-urls remark plugin calls git rev-list -1 HEAD <svg-file> to obtain a commit SHA for building jsdelivr URLs, so the SVG files must be committed before that plugin runs.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• Yes
• No

If you answered "yes" above, how did you use AI assistance?

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

Disclosure

If you answered "yes" to using AI assistance, please provide a short disclosure indicating how you used AI assistance. This helps reviewers determine how much scrutiny to apply when reviewing your contribution.

This PR was written primarily by Claude Code as part of an automated CI failure investigation routine. The root-cause analysis (shallow-clone missing the PR branch → missing --force-with-lease tracking ref) and the fix (adding git fetch) were generated and validated by Claude Code. A human operator reviewed the final diff before merge.

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Generated by Claude Code