Previously only HTTP 429 triggered a retry. Network failures, 5xx
responses, and mid-stream drops all hard-failed the turn.
- Add TransientError for 5xx and network-level failures; streamRequest
wraps client.Do errors and >=500 responses in it
- Merge pre-stream and mid-stream retry into one loop (maxTransientRetries=3)
covering rate limits, transient errors, and pure stream drops
- On stream drop with ctx cancelled: record partial state and return
(existing pause behaviour preserved)
- On stream drop without cancellation: close any open <think> block,
emit retry countdown, restart ChatStream from the same history
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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