docs: accept ADR-009, mark ADR-008 superseded

ADR-009 (PVE version support v3.x + v4.0 strategy) accepted.
ADR-008 marked Superseded by ADR-009.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/cos/adrs/ADR-008-pve-version-support-matrix.md

@@ -1,7 +1,7 @@
 # ADR-008: PVE Version Support Matrix
 
 **Date**: 2026-05-19  
-**Status**: Accepted  
+**Status**: Superseded by ADR-009  
 **Deciders**: Kevin Adams
 
 ## Context

.claude/cos/adrs/ADR-009-pve-version-support-v3.md

@@ -1,9 +1,9 @@
 # ADR-009: PVE Version Support Matrix — v3.x and v4.0 Versioning Strategy
 
 **Date**: 2026-05-31  
-**Status**: Draft  
+**Status**: Accepted  
 **Deciders**: Kevin Adams  
-**Supersedes**: ADR-008 (pending acceptance of this ADR)
+**Supersedes**: ADR-008
 
 ## Context