chore(state): record CRG-grade update from estate sweep

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.machine_readable/6a2/STATE.a2ml

@@ -5,7 +5,7 @@ last-updated = "2026-04-13"
 
 [status]
 phase = "concept"
-grade = "C"
+grade = "E"
 readiness = "C" # 6/10 (Concept Phase)
 
 [features]