Cheng Yongru 3f2cad8a49 fix(memory): fall back to raw_archive on LLM error response
When chat_with_retry returns an error response (finish_reason='error')
instead of raising an exception, archive() previously treated the error
message as a valid summary and wrote it to history.jsonl, while the
original session data was already cleared by /new — causing irreversible
data loss.

Fix: check finish_reason after the LLM call and raise RuntimeError on
error responses, which naturally falls through to the existing raw_archive
fallback. This preserves the original messages in history.jsonl instead
of losing them.

Fixes #3244
2026-04-17 17:33:18 +08:00
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