docs(phase-08): complete phase execution

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

.planning/STATE.md

@@ -4,7 +4,7 @@ milestone: v1.0
 milestone_name: milestone
 status: "Ready for /gsd:plan-phase 8"
 stopped_at: Completed 08-task-delete 08-02-PLAN.md
-last_updated: "2026-03-18T20:03:07.082Z"
+last_updated: "2026-03-18T20:08:14.841Z"
 last_activity: 2026-03-18 — Created v1.2 milestone
 progress:
   total_phases: 3