feat: add Atomizer HQ multi-agent cluster infrastructure

- 8-agent OpenClaw cluster (Manager, Tech-Lead, Secretary, Auditor,
  Optimizer, Study-Builder, NX-Expert, Webster)
- Orchestration engine: orchestrate.py (sync delegation + handoffs)
- Workflow engine: YAML-defined multi-step pipelines
- Agent workspaces: SOUL.md, AGENTS.md, MEMORY.md per agent
- Shared skills: delegate, orchestrate, atomizer-protocols
- Capability registry (AGENTS_REGISTRY.json)
- Cluster management: cluster.sh, systemd template
- All secrets replaced with env var references

hq/config/shared-credentials.json

@@ -0,0 +1,20 @@
+{
+  "_comment": "Centralized credentials for all OpenClaw instances. Run sync-credentials.sh after editing.",
+  "anthropic": {
+    "type": "token",
+    "provider": "anthropic"
+  },
+  "openai-codex": {
+    "type": "oauth",
+    "provider": "openai-codex",
+    "source": "codex-cli"
+  },
+  "google": {
+    "type": "token",
+    "provider": "google"
+  },
+  "openrouter": {
+    "type": "provider-key",
+    "scope": "mario-only"
+  }
+}