fix: avoid stream retry panic on missing model config#343
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Summary
Fixes #339.
When a streaming LLM call returns an overloaded/rate-limit error and the fallback result does not include a base model config,
withStreamingRetriesdereferencedfallbackRes.BaseModelConfigwhile classifying the error. That could turn the original provider error into a nil pointer panic.This change treats a missing base model config as non-Claude-Max for classification, preserving the original retry/error handling path instead of panicking.
Test plan
PATH=/home/bobo/.local/go-toolchain/go/bin:$PATH go test ./model -run TestWithStreamingRetriesHandlesMissingBaseModelConfig -count=1PATH=/home/bobo/.local/go-toolchain/go/bin:$PATH go test ./modelPATH=/home/bobo/.local/go-toolchain/go/bin:$PATH go test ./...