chore(BA-6003): add news fragment

jopemachine · claude · jopemachine · commit 72f3436fe472 · 2026-05-12T12:47:31.000+09:00
Co-Authored-By: Claude Opus 4.7 (1M context) &lt;noreply@anthropic.com&gt;
diff --git a/changes/11554.enhance.md b/changes/11554.enhance.md
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+Migrate every remaining pydantic `BaseModel` subclass across `src/ai/backend/` to `BackendAIModel`, so any `model_validate()` failure auto-converts to a `BackendAIModelValidationFailed` (HTTP 400) instead of leaking as raw `pydantic.ValidationError`.

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	`1`	+Migrate every remaining pydantic `BaseModel` subclass across `src/ai/backend/` to `BackendAIModel`, so any `model_validate()` failure auto-converts to a `BackendAIModelValidationFailed` (HTTP 400) instead of leaking as raw `pydantic.ValidationError`.