book: evidence boundary (clean-lake watermark) + ch02 cost reality + ch05 clean-lake reset — exp 21-31, chat mining

This commit is contained in:
TradeAC Book Agent
2026-08-18 22:45:11 +00:00
parent c93424e76c
commit 3562b7f776
16 changed files with 6955 additions and 32 deletions
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