Adds a read-only /backtest page showing how the bot WOULD have traded past
sessions under the CURRENTLY configured live settings: theoretical ORB fires
from setup_events, replayed through the shared exit engine (simulate_exit +
ExitConfig.from_env(), same adverse-fill accounting the exit-experiment
harness uses), screened through the shared population gate and (optionally)
the live regime gate. No new simulation math — replay.replay_window() is pure
assembly of existing pieces (reconstruct_fires_from_setups, _fire_in_population,
_load_regime_favorable, simulate_exit); api/main.py adds the /backtest and
/api/backtest routes plus a dedicated-lock 10-min cache so a slow replay never
blocks the live dashboard's SSE stream. Also extends /api/chart with an
optional date= anchor so the trade drill-in chart modal can reach sessions
older than the existing 72h-from-now window, and adds a one-line BACKTEST nav
link to the live dashboard header.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
