checkpoint(milestone): v0.7 complete → v0.6.6 (milestone release)

Clear checkpoint: milestone v0.7 Fraternal Groups Foundation complete.
Release: v0.6.6 (release_id 789). Next milestone: none queued.

---ci---
project: oy
phase: 6
milestone: v0.7
status: complete
---/ci---

.ciagent/CHECKPOINT.json

@@ -1,14 +1,15 @@
 {
   "milestone": "v0.7",
-  "milestone_complete": false,
-  "milestone_release_tag": null,
-  "release_id": 776,
+  "milestone_complete": true,
+  "milestone_release_tag": "v0.6.6",
+  "release_id": 789,
   "project": "oy",
-  "phase": 0,
-  "phase_role": "pre_execution",
-  "stage": "grill",
+  "phase": 6,
+  "phase_role": "final",
+  "stage": "complete",
   "attempts": 0,
-  "updated_at": "2026-08-19T00:04:00Z",
+  "updated_at": "2026-08-19T00:35:00Z",
+  "phase_tag": "v0.6.6",
   "next_milestone": null,
   "previous_milestone": {
     "milestone": "v0.6",