The live loop gated trading + EOD flatten on weekday()<5 only, so a market
HOLIDAY read as a normal session. On a full closure the EOD flatten (15:55-16:00
window) would cancel the protective bracket/stop legs and then fail to fill the
market sell (exchange shut) — leaving positions NAKED over the holiday weekend.
Tomorrow is Juneteenth (Fri 2026-06-19, NYSE closed), with 3 open positions.
- runtime/market_calendar.py: NYSE full closures + early closes (no external
dep), is_trading_day / is_regular_hours / session_close_hm. 2026 confirmed.
- _is_rth() now uses is_regular_hours() (holiday + early-close aware).
- EOD flatten skips when session_close_hm() is None (weekend/holiday) and uses
the real close (13:00 on early-close days) — so it only flattens into an OPEN
market that can actually fill the sell, never orphaning the stops.
tests/unit/runtime/test_market_calendar.py: 6 passed. Verified Juneteenth ->
not a trading day -> EOD skipped -> the 3 GTC stops stay in place.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
