Mid-stream api_error/overloaded_error SSE events (e.g. a local provider such
as LM Studio rejecting a malformed tool_call) arrive inside the 200 SSE body,
bypassing withRetry — which only guards stream creation — so they were
surfaced as a terminal API error that ended the turn with no retry.
Add withStreamRetry around queryModel: when an attempt produced zero output
(no tool_use block completed, so query.ts never started a tool — safe w.r.t.
the double-tool-execution hazard, inc-4258), re-establish the stream and retry
up to CLAUDE_STREAM_TRANSIENT_RETRY_MAX times (default 2) before surfacing the
error. Covers both the streaming and non-streaming query wrappers; adds unit
tests for the retry loop and the transient-error classifier.
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