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

@@ -7,7 +7,7 @@ project = "januskey"
 version = "1.0.0"
 last-updated = "2026-04-04"
 status = "active"
-crg-grade = "C"
+crg-grade = "D"
 
 [project-context]
 name = "januskey"