BTC Defensive v0 (SHADOW)

Shadow candidate, stamped 2026-09-26. Validated features only, sign-corrected contrarians; DEFENSIVE when >=2 net stress signals fire. Writes a daily risk state; ALLOCATES NOTHING. The claim is the live record, graded independently by Adam's harness. Pre-registered scoring rule frozen in scripts/btc_defensive_v0_shadow.py — edits require a new sensor id.