The ForwardTracker now optionally throttles booked exposure off the live track's own
running drawdown: flatten to 0 once drawdown exceeds kill_dd, re-enter once it recovers
inside reenter_dd. The drawdown SIGNAL tracks shadow (un-throttled) equity so recovery is
observable while flat; the booked NAV reflects the throttled book. No-lookahead (each
day's decision uses prior-day kill-state); state is persisted (shadow_nav/shadow_peak/
killed) and lazy-inits for tracks that predate the switch.
Wired ON in both live entry points via new settings combined_book_kill_dd (0.15) /
combined_book_reenter_dd (0.07): the Dagster combined_forward_nav asset and the
forward-track CLI. Default OFF at the tracker/factory level so existing trackers and
tests are unchanged. Tests 54 passed (incl. new live-killswitch test); mypy clean on
changed lines (pre-existing debt untouched).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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