[Bug] Malformed SSE JSON chunks are silently swallowed in streaming

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Summary

parseOpenAiSseLine catches JSON.parse failures and silently returns {}. When a provider emits a truncated or corrupt data: chunk mid-stream (e.g. a network glitch), the chunk is dropped with no diagnostic. Combined with the missing body-consumption timeout in streaming requests, a broken connection can leave the user with a partial suggestion and no error at all.

Location

• src/providers/sse.ts:77-99 (OpenAI parser), specifically the catch at :95-97

Code snippet

try {
  const parsed = JSON.parse(payload) as { ... };
  ...
  return result;
} catch {
  // Skip malformed JSON chunks
}
return {};

Suggested fix

Distinguish "not a data line" (fine to ignore) from "line starts with data: but payload is not valid JSON" (a real protocol anomaly). For the latter, surface a descriptive error to the caller (or warn) rather than continuing silently — e.g. track consecutive malformed chunks and fail the stream after a threshold.

Impact

• Silent partial/missing streamed content with no diagnostic when a connection hiccups mid-stream.
• In combination with the streaming timeout gap, --stream can terminate with incomplete output and the user has no signal anything went wrong.