Three resilience improvements to the pipeline:
1. LLMResponse(str) subclass carries finish_reason metadata from the LLM.
_safe_parse_llm_response detects truncation (finish=length) and raises
LLMTruncationError instead of wastefully retrying with a JSON nudge
that makes the prompt even longer.
2. Stage 4 classification now batches moments (20 per call) instead of
sending all moments in a single LLM call. Prevents context window
overflow for videos with many moments. Batch results are merged with
reindexed moment_index values.
3. run_pipeline auto-resumes from the last completed stage on error/retry
instead of always restarting from stage 2. Queries pipeline_events for
the most recent run to find completed stages. clean_reprocess trigger
still forces a full restart.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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