Stage 4 classification was truncating (finish=length) because the 0.15x
output ratio underestimated token needs. Inflated all stage ratios,
bumped the buffer from 20% to 50%, raised the floor from 2048 to 4096,
and fixed _safe_parse_llm_response to forward max_tokens on retry
instead of falling back to the 65k default.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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