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1e629721b9
Claude models on Vertex AI were being sent through the generic OpenAI- compatible partner endpoint, which 404s/errors for Claude on at least some projects. Route them through Vertex's native Anthropic Messages API (publishers/anthropic/.../rawPredict) instead, stripping the body-level model field rawPredict rejects and injecting the required anthropic_version field. rawPredict only ever returns a complete JSON body, never real SSE framing, so streaming requests now get a genuine Anthropic-format SSE stream synthesized from that JSON (message_start/content_block_*/ message_delta/message_stop), which the existing claude-to-openai response translator already knows how to parse. Also fixes two response-format resolution bugs that silently dropped a custom model's DB-stored targetFormat override whenever the model id also existed in the static provider registry (as claude-sonnet-4-6 and claude-opus-4-7 do under vertex): resolveModelOrError had its own ad-hoc resolution that never consulted the override, and even once fixed, executeChatWithBreaker discarded the correctly-resolved format before handleChatCore's own resolution ran a second time.