DEVSITE-2405 no-dead-urls linter false positives for anchor URLs, mailto links, and redirects

[jiangy10]

@claude

The no-dead-urls linter rule is producing false positives for three URL patterns that should be considered valid:

• Anchor/hash URLs - URLs with # fragments are flagged as dead (e.g., https://spectrum.adobe.com/page/theming/#Resources-for-Spectrum-for-Adobe-Express)
• mailto: links - Email links are flagged as dead URLs (e.g., ccintrev@adobe.com)
• Redirect URLs - URLs that redirect HTTP→HTTPS are flagged instead of following the redirect (e.g., http://discord.gg/nc3QDyFeb4 → https://discord.com/invite/nc3QDyFeb4)

create and name the branch DEVSITE-2405, fix the linter rules

[claude]

Claude finished @jiangy10's task in 8m 49s —— View job • claude/issue-86-20260514-1915 • Create PR ➔

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Fix for DEVSITE-2405

• Gather context (read linter and runLint.js)
• Research remark-lint-no-dead-urls options
• Fix false positives for mailto: links (add /^mailto:/ to skipUrlPatterns)
• Fix false positives for anchor/hash URLs (add checkAnchor: false)
• Fix false positives for redirect URLs (fix followRedirect → followRedirects)
• Commit and push

Changes made to bin/runLint.js

Three fixes applied to both remarkLintNoDeadUrls usages (full-lint mode and --external-links-only mode):

1. mailto: links — Added /^mailto:/ to the built-in skipUrlPatterns so email links (mailto:user@example.com) are never passed to the URL checker.

2. Anchor/hash URLs — Added checkAnchor: false to deadOrAliveOptions. This prevents dead-or-alive from verifying that the #fragment identifier exists in the fetched page HTML (which fails for dynamically-rendered or SPA pages).

3. Redirect URLs — Renamed followRedirect: true → followRedirects: true, which is the correct option name recognized by dead-or-alive. The previous misspelling was silently ignored, so HTTP→HTTPS redirects weren't being followed.