Merge milestone/v0.5-bearers-runtime into main (v0.5 Bearers Runtime feature milestone release)

v0.5 Bearers Runtime — 7 runtime REQs (REQ-033..039) shipped as feature.
8 modules promoted to runtime (MsgServer + simtest). cosmos-sdk v0.50.8 +
ibc-go v8.2.1 added (G-006 controlled exception). G-003 + locked-const
firewalls intact. 8 keeper packages ≥80% coverage. 5 GRILL decisions
ratified; 8 binding fixes landed; 5 P1+ flagged for v0.6+.

---ci---
project: oy
phase: 8
milestone: v0.5
status: complete
requirements:
  covered: [REQ-033, REQ-034, REQ-035, REQ-036, REQ-037, REQ-038, REQ-039]
  partial: []
---/ci---

.ciagent/config.json

@@ -6,9 +6,9 @@
     }
   ],
   "active_project": "oy",
-  "milestone": "v0.4",
-  "milestone_type": "nfr",
-  "tag_base": "v0.3.x",
+  "milestone": "v0.5",
+  "milestone_type": "feature",
+  "tag_base": "v0.4.x",
   "autonomy": {
     "level": "full",
     "escalation_hooks": ["deploy", "delete_data", "merge_to_main"],