Validate and update links (STF-557)

[oschwald]

Adds a lychee link checker config and CI workflow, and
fixes stale/redirecting links across the repo. Mirrors the setup landed in the
GeoIP2 client repos.

What's added

• lychee.toml — shared link-checker config (max_redirects = 0, accepts
  5xx/403/429/999, segment-anchored path excludes for bin/, obj/,
  .worktrees/, docs/public/, and releasenotes.md).
• .github/workflows/links.yml — runs lychee on push/PR, weekly cron, and
  manual dispatch. Uses jdx/mise-action with install: false +
  MISE_AUTO_INSTALL: false so only lychee is installed (not the full .NET
  toolchain).
• mise.toml — pins lychee = "0.23.0" and adds a check-links task. The
  per-platform mise.lock entries for lychee were populated via mise lock.
• .lycheecache added to .gitignore.

Links updated (old -> new)

• https://dev.maxmind.com/minfraud?lang=en -> https://dev.maxmind.com/minfraud/?lang=en (README.md, CLAUDE.md)
• https://dev.maxmind.com/minfraud/report-a-transaction?lang=en -> .../report-a-transaction/?lang=en (README.md)
• https://docs.microsoft.com/.../http-requests?view=aspnetcore-3.1#typed-clients -> https://learn.microsoft.com/... (README.md)
• https://www.maxmind.com/en/support -> https://support.maxmind.com/knowledge-base (README.md)
• https://dev.maxmind.com/minfraud/track-devices?lang=en -> .../track-devices/?lang=en (Response/Device.cs)
• https://dev.maxmind.com/minfraud/api-documentation/requests?lang=en -> .../requests/?lang=en (Request/Transaction.cs)
• https://dev.maxmind.com/minfraud/api-documentation/responses?lang=en#errors -> .../responses/?lang=en#errors (Exception/InvalidRequestException.cs)
• https://dev.maxmind.com/minfraud/api-documentation/responses?lang=en#schema--response--warning -> .../responses/?lang=en#schema--response--warning (Response/Warning.cs)
• https://www.maxmind.com/en/minfraud-interactive/#/custom-rules (404) -> https://www.maxmind.com/en/accounts/current/minfraud-interactive/custom-rules (Request/CustomInputs.cs); matches the canonical URL used by the Java client.
• https://docs.microsoft.com/en-us/dotnet/api/system.hashcode -> https://learn.microsoft.com/en-us/dotnet/api/system.hashcode?view=net-10.0 (UnitTest/JsonElementComparer.cs)
• https://tools.ietf.org/html/rfc8259#section-4 -> https://datatracker.ietf.org/doc/html/rfc8259#section-4 (UnitTest/JsonElementComparer.cs)
• https://stackoverflow.com/questions/60580743/...jtoken-deepequal... -> ...jtoken-deepequals... (UnitTest/JsonElementComparer.cs)

Excluded as false positives

• Unit-test/example placeholder hosts: www.maxmind.com root, test.maxmind.com,
  www.mm.com, amazon.com (test fixtures / README sample code, not navigable links).
• #schema-- anchors on the dev.maxmind.com responses page: the docs site is a
  single-page app, so those deep anchors are rendered client-side and aren't in
  the server HTML — lychee can't verify the fragment even though the page (200)
  and anchor are valid.

Verification

• mise run check-links: 75 Total, 36 OK, 0 Errors, 39 Excluded.
• precious lint --all passes.

Part of STF-557.

🤖 Generated with Claude Code

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