Fix weekly link checker: remove deprecated --exclude-mail

[Spider333]

Summary

• Removed --exclude-mail flag from lychee args — it was removed in lychee v0.23.0 (mail exclusion is now the default behavior)
• This was the root cause of the workflow failing in 5 seconds with 4 annotations

Test plan

• Merge and trigger workflow manually (workflow_dispatch) to confirm it passes

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated link checking configuration to validate mail links during automated checks.

[github-actions]

PR Auto-Review

Looks good! No guardrail violations detected. A maintainer will review this shortly.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4a78b1c2-8a8e-4bea-bd20-b2d438b6e52b

📥 Commits

Reviewing files that changed from the base of the PR and between aa83239 and e6d1855.

📒 Files selected for processing (1)

• .github/workflows/link-checker.yml

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📝 Walkthrough

Walkthrough

The --exclude-mail argument was removed from the Lychee link checker invocation in a GitHub Actions workflow, modifying how the link checker processes email-related content during automated checks.

Changes

Cohort / File(s)	Summary
Link Checker Configuration .github/workflows/link-checker.yml	Removed the --exclude-mail argument from the Lychee link checker command invocation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A checkmark bounces, mail finds its way,
No more exclusions block the day,
Links dance freely, east and west,
The workflow runs its very best! 🐰✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: removing the deprecated --exclude-mail flag from the link checker workflow.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/link-checker-exclude-mail

📝 Coding Plan

• Generate coding plan for human review comments

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[github-actions]

PR Auto-Review

Looks good! No guardrail violations detected. A maintainer will review this shortly.