feat: update architecture diagram for Everclaw v2026.2.23

- Gateway Guardian v4 → v5 (direct curl probes)
- Add Venice Key Monitor v2 (proactive DIEM balance checking)
- Add Venice 402 Watchdog (reactive billing error detection)
- Add Three-Shifts v2 (cyclic task execution engine)

Author: EverClaw

README.md

@@ -94,7 +94,10 @@ SmartAgent
 │   │   └── Dynamic Model Discovery (auto-discovers 35+ models)
 │   ├── Diagnostic Tool (18-check health scanner)
 │   ├── Always-On Proxy-Router (launchd KeepAlive, auto-restart)
-│   ├── Gateway Guardian v4 (billing-aware self-healing watchdog)
+│   ├── Gateway Guardian v5 (direct curl probes, no Signal spam)
+│   ├── Venice Key Monitor v2 (proactive DIEM balance checking)
+│   ├── Venice 402 Watchdog (reactive billing error detection)
+│   ├── Three-Shifts v2 (cyclic task execution engine, 15-min loops)
 │   └── Smart Session Archiver (prevents dashboard overload)
 └── SmartAgent Config
     ├── SOUL.md (agent personality)