Validate and update links (STF-557)

[oschwald]

Adds a lychee link checker config and a CI workflow, and fixes stale/redirecting links across the docs and source.

Tooling

• lychee.toml: shared config mirroring the dev-site/blog-site settings (max_redirects = 0, 500..=599 accepted, segment-anchored exclude_path).
• .github/workflows/links.yml: runs lychee via mise (install: false + MISE_AUTO_INSTALL: false so only lychee is installed, not the full Ruby toolchain), on push/PR, weekly cron, and manual dispatch.
• mise.toml: pins lychee = "0.23.0" and adds a check-links task scanning './**/*.md' './lib/**/*.rb' './*.gemspec'. mise.lock updated with all-platform lychee entries.
• .gitignore: ignores .lycheecache.

Link fixes (old -> new)

• https://dev.maxmind.com/minfraud?lang=en -> https://dev.maxmind.com/minfraud/?lang=en (and bare /minfraud -> /minfraud/)
• https://dev.maxmind.com/minfraud/api-documentation/requests?lang=en#... -> .../requests/?lang=en#...
• https://dev.maxmind.com/minfraud/report-a-transaction?lang=en -> .../report-a-transaction/?lang=en (and bare variant -> trailing slash)
• https://dev.maxmind.com/minfraud/track-devices?lang=en -> .../track-devices/?lang=en
• https://dev.maxmind.com/minfraud/api-documentation/responses/schema--response--risk-score-reason--multiplier-reason -> .../responses/#schema--response--risk-score-reason--multiplier-reason (canonical fragment form, matching the other minFraud client libraries)
• https://tools.ietf.org/html/rfc3339 -> https://datatracker.ietf.org/doc/html/rfc3339
• https://contributor-covenant.org -> https://www.contributor-covenant.org/
• https://opensource.org/licenses/MIT -> https://opensource.org/license/MIT
• https://www.maxmind.com/en/support -> https://support.maxmind.com/knowledge-base

The responses-page schema anchor is rendered client-side, so its fragment is absent from the static HTML lychee fetches (the page itself is a 200). That single fragment is excluded in lychee.toml.

Final lychee run: 52 Total, 48 OK, 0 Errors, 4 Excluded. RuboCop passes on all edited files.

Part of STF-557.

🤖 Generated with Claude Code

[gemini-code-assist]

Code Review

This pull request integrates the Lychee link checker into the repository. It adds a lychee.toml configuration file, registers the lychee tool and a check-links task in mise.toml (and updates mise.lock), and adds .lycheecache to .gitignore. Additionally, numerous documentation links across markdown files and Ruby source files are updated to their canonical forms (e.g., adding trailing slashes or updating domains) to ensure they pass validation. Feedback on the changes suggests making the GitHub blob URL exclusion regex in lychee.toml more robust to support branch/tag refs and line ranges.

Important

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[gemini-code-assist]

The current regular expression for excluding GitHub blob URLs has two limitations:

1. It only matches hex commit SHAs ([0-9a-fA-F]+) and will fail to match URLs that use branch names (like main or master) or tags as the ref.
2. It only matches single line numbers (#L\d+$) and will fail to match line ranges (like #L10-L15).

We can make this regex more robust by:

• Replacing [0-9a-fA-F]+ with [^/]+ to support any ref (branch, tag, or SHA).
• Updating the anchor pattern to #L\d+(?:-L\d+)?$ to support both single lines and line ranges.

Suggested change

	'^https://github\.com/[^/]+/[^/]+/blob/[0-9a-fA-F]+/.+#L\d+$',
	'^https://github\.com/[^/]+/[^/]+/blob/[^/]+/.+#L\d+(?:-L\d+)?$',

[oschwald]

This GitHub-blob exclude is taken verbatim from the dev-site lychee config and is intentionally narrow — it only skips unverifiable blob/<sha>#L.. line-fragment links. Branch-ref blob links are checked normally and resolve fine in these repos, so we kept the shared pattern.

— Claude (posted on Greg's behalf)