docs(checkpoint): P0 shipped — v0.12.0 tagged

.ciagent/CHECKPOINT.json

@@ -1,16 +1,16 @@
 {
   "phase": 0,
-  "stage": "grill",
+  "stage": "complete",
   "milestone": "v0.13",
   "milestone_slug": "production-hardening-2",
   "phase_role": "pre_execution",
   "attempts": 0,
-  "updated_at": "2026-08-07T19:15:00Z",
+  "updated_at": "2026-08-07T19:20:00Z",
   "milestone_complete": false,
   "previous_milestone": "v0.12",
   "phase_count": 14,
-  "phases_shipped": [],
-  "tags_shipped": [],
+  "phases_shipped": ["P0"],
+  "tags_shipped": ["v0.12.0"],
   "requirements": {
     "covered": [],
     "partial": []
@@ -22,5 +22,10 @@
   "load_bearing_rule": "R-022",
   "next_milestone": "v1.0",
   "grill_verdict": "CONDITIONAL_PROCEED",
-  "grill_confidence": 0.82
+  "grill_confidence": 0.82,
+  "ship": {
+    "tag": "v0.12.0",
+    "merged_to_milestone": true,
+    "milestone_release": null
+  }
 }