Thread per-commitment enforcement level through to the snapshot

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

internal/store/store.go

@@ -25,6 +25,8 @@ type Snapshot struct {
 	ReflectionStatus string `json:"reflection_status,omitempty"`
 	ReflectionRecap  string `json:"reflection_recap,omitempty"`
 	CarryForward     string `json:"carry_forward,omitempty"`
+
+	EnforcementLevel domain.EnforcementLevel `json:"enforcement_level,omitempty"`
 }
 
 // DefaultPath returns ~/.antidrift/state.json.