1. Blueprint updates - Added NO_GROUPS escalation docs to all 12 agent blueprints

2. Multi-image Docker architecture - Created role-specific Dockerfiles:
  - agent-base.Dockerfile (shared foundation)
  - agent-pm.Dockerfile, agent-dev-be.Dockerfile, agent-dev-fe.Dockerfile
  - agent-qa-be.Dockerfile, agent-qa-fe.Dockerfile, agent-doc.Dockerfile, agent-ux.Dockerfile
3. Orchestrator updates - roboco/runtime/orchestrator.py:
  - Added AGENT_IMAGES mapping and get_agent_image() function
  - Updated _ensure_agent_image() to build base + specialized images
  - Updated _spawn_container() to use role-specific image
  - Made _generate_mcp_config() role-aware (though kept notify for all since they need to receive)

docker/agent-dev-be.Dockerfile

@@ -0,0 +1,17 @@
+# Backend Developer Agent
+# Python/FastAPI development tools
+
+FROM roboco-agent-base
+
+USER root
+
+# Backend-specific tools
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    postgresql-client \
+    redis-tools \
+    && rm -rf /var/lib/apt/lists/*
+
+USER agent
+
+LABEL role="backend-developer"
+LABEL description="Backend developer agent - Python, FastAPI, databases"