Exchange Session Detector Production-grade pattern for detecting exchange trading sessions with full DST, holiday, and lunch break support. Validated in across 10 global exchanges. Self-Evolving Skill : This skill improves through use. If instructions are wrong, parameters drifted, or a workaround was needed — fix this file immediately, don't defer. Only update for real, reproducible issues. When to Use - Adding session flags (is nyse session, is lse session, etc.) to time-series DataFrames - Detecting whether a timestamp falls within trading hours for any major exchange - Checking for holida…