docs: add EU region & data residency page - #1169

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Found 0 errors and 12 warnings in 0.000 seconds. Run fern check --warnings to print out the warnings not shown.

Discriminated union "UpdateToolsResponse (update > tools > Response)" lists "#/components/schemas/GhlTool" in its oneOf/anyOf, but it is not present in the discriminator mapping. This variant will be omitted from the generated union, so payloads using it will fail to serialize or deserialize. Add it to the discriminator mapping to include it.

Discriminated union "UpdateToolsRequestBody (update > tools > Request > Body)" lists "#/components/schemas/UpdateCodeToolDTO" in its oneOf/anyOf, but it is not present in the discriminator mapping. This variant will be omitted from the generated union, so payloads using it will fail to serialize or deserialize. Add it to the discriminator mapping to include it.

Discriminated union "UpdateToolsRequest (update > tools > Request)" lists "#/components/schemas/UpdateCodeToolDTO" in its oneOf/anyOf, but it is not present in the discriminator mapping. This variant will be omitted from the generated union, so payloads using it will fail to serialize or deserialize. Add it to the discriminator mapping to include it.

Discriminated union "DeleteToolsResponse (delete > tools > Response)" lists "#/components/schemas/GhlTool" in its oneOf/anyOf, but it is not present in the discriminator mapping. This variant will be omitted from the generated union, so payloads using it will fail to serialize or deserialize. Add it to the discriminator mapping to include it.

Discriminated union "GetToolsResponse (get > tools > Response)" lists "#/components/schemas/GhlTool" in its oneOf/anyOf, but it is not present in the discriminator mapping. This variant will be omitted from the generated union, so payloads using it will fail to serialize or deserialize. Add it to the discriminator mapping to include it.

Discriminated union "CreateToolsResponse (create > tools > Response)" lists "#/components/schemas/GhlTool" in its oneOf/anyOf, but it is not present in the discriminator mapping. This variant will be omitted from the generated union, so payloads using it will fail to serialize or deserialize. Add it to the discriminator mapping to include it.

Discriminated union "CreateToolsRequest (create > tools > Request)" lists "#/components/schemas/CreateCodeToolDTO" in its oneOf/anyOf, but it is not present in the discriminator mapping. This variant will be omitted from the generated union, so payloads using it will fail to serialize or deserialize. Add it to the discriminator mapping to include it.