Add controller="combined" = K(D*) sizing + per-sleeve WindowedEdgeHealth
structural-retirement gate + the existing DrawdownKillSwitch backstop. The only
behavioural delta vs "killswitch" is the retirement gate filtering the active
sleeve set; with all sleeves healthy combined == killswitch bit-identically.
- RetirementGate (domain/edge_decay.py): pure hysteresis state machine over a
WindowedEdgeHealth — retire after retire_window sub-retire_floor days, re-admit
after readmit_window >= readmit_floor days; bootstrap-safe; to_dict/from_dict.
- Wire combined into both overlays (live==replay): paper_risk_overlay replays the
gate from scratch; IncrementalRiskOverlay keeps per-sleeve gate state advanced
over newly-appeared days. ISV over survivors; leverage + killswitch unchanged.
- Tests: pure state machine (retire/dip/re-admit/hysteresis/bootstrap/roundtrip),
inert-on-healthy (combined==killswitch exact), synthetic dead-sleeve (combined
retires B and beats killswitch NAV; re-admits on recovery), live==replay golden
with a dying sleeve. Full suite green (756 passed).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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