feat(eval): memoir A/B chapter judging and eval-web parity with dialogue
- Judge baseline excerpt and library chapter separately; build_memoir_compare_summary for gate, nine-dim and leaf deltas.
- Memoir SSE chapter payload: baseline_judge, compare_summary, baseline_judge_error.
- MemoirJudgeOutput: loose score coercion and post-validate clamp; memoir judge prompt caps from settings.
- app-eval-web: two-column MemoirScoreCard layout, MemoirCompareSummary, chapter blocks and CSS.
- Add memoir_compare_summary, log_events, celery_log_context, memoir_pipeline_progress; tests and migration 0014.
- Misc: memory/evidence and enrichment paths, task/orchestrator updates, internal-eval docs, env examples.
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