Two fixes:
1. page_moment_indices was referenced before assignment in the page
persist loop — moved assignment to top of loop body. This caused
"cannot access local variable" errors on every stage 5 run.
2. Stage 5 now catches LLMTruncationError and splits the chunk in
half for retry, instead of blindly retrying the same oversized
prompt. This handles categories where synthesis output exceeds
the model context window.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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