* fix: add "max" to AnthropicModelSettings effort type
The effort field on AnthropicModelSettings only accepted
"low" | "medium" | "high", but the LLMConfig.effort field and the
Anthropic API both support "max" for Opus 4.6. This type mismatch
caused Pydantic validation to reject conversation updates that set
effort to "max" (mapped from xhigh in letta-code).
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