chore(api): refresh image model API reference (#115)

## Summary

Refresh the CLI's transformed OpenAPI snapshot and CastIron generation
metadata for the current image-model documentation.

## Changes

- Include the GPT Image 2 model names in the JSON image-editing schema
and refresh the Responses image-generation documentation, including the
supported `chatgpt-image-latest` alias.
- No generated CLI command, flag, public API, or runtime behavior
changes.

## (manual)

No handwritten SDK changes or merge-conflict resolutions.

Co-authored-by: apcha-oai <228803254+apcha-oai@users.noreply.github.com>

Author: apcha-oai

.castiron.stats.yml

@@ -1,8 +1,8 @@
 schema_version: 1
-generation_id: 94c4c9fb-2ce1-42d1-b5c0-d8bc191bba4f
-openapi_spec_hash: a99ded1ea34cf528a9cd5f064167f26a
-openapi_transformed_spec_hash: e24c9d9339620c3cce8bbdd80e9ef8ed
+generation_id: 573ef3f3-70b3-469e-b94e-e45b454e0f21
+openapi_spec_hash: a85edbfc22ff719d064bce2705c7394e
+openapi_transformed_spec_hash: f8e7644df5aee22dfcd0ea2b70942054
 config_hash: 85382dd94c503b5d225adc7636a77c9f
-codegen_sha: f46bf3ed0393c2ac417c28795218dc77bcb3639f
+codegen_sha: 41a541ca2502e24807be5dbb70483623cfb27032
 codegen_hash: 53578461aae4eae57293c4cac0f13154c80fa8c277371932c76970d211bc78e1
-public_codegen_sha: 175f05ee3eda671c279e61f4dcbf3f7101a9522d
+public_codegen_sha: af6fa13681d98be26da62c2f835b09242c9a3beb

api_reference/openapi.transformed.yml

@@ -35398,14 +35398,16 @@ components:
           - type: string
             enum:
             - gpt-image-1.5
+            - gpt-image-2
+            - gpt-image-2-2026-04-21
             - gpt-image-1
             - gpt-image-1-mini
             - chatgpt-image-latest
           - type: 'null'
           x-oaiTypeLabel: string
           default: gpt-image-1.5
           example: gpt-image-1.5
-          description: The model to use for image editing.
+          description: The GPT image model to use for image editing, including `gpt-image-2` and its dated snapshot `gpt-image-2-2026-04-21`.
         images:
           type: array
           minItems: 1
@@ -39136,7 +39138,10 @@ components:
             - gpt-image-1.5
             - chatgpt-image-latest
             description: |
-              The image generation model to use. Default: `gpt-image-1`.
+              The image generation model to use. One of `gpt-image-1`,
+              `gpt-image-1-mini`, `gpt-image-1.5`, `gpt-image-2`,
+              `gpt-image-2-2026-04-21`, or `chatgpt-image-latest`. Default:
+              `gpt-image-1`.
             default: gpt-image-1
         quality:
           type: string
@@ -68512,7 +68517,10 @@ components:
             - gpt-image-1.5
             - chatgpt-image-latest
             description: |
-              The image generation model to use. Default: `gpt-image-1`.
+              The image generation model to use. One of `gpt-image-1`,
+              `gpt-image-1-mini`, `gpt-image-1.5`, `gpt-image-2`,
+              `gpt-image-2-2026-04-21`, or `chatgpt-image-latest`. Default:
+              `gpt-image-1`.
             default: gpt-image-1
         quality:
           type: string