feat(agent-zero): Zulip adapter with A2A protocol for kagentz

New project: agent-zero-zulip/ — direct Zulip integration for Agent Zero
agents using A2A protocol internally.

Architecture:
  kagentz (CT 105) ┌──────────────────────┐
                    │ Zulip Adapter  ◄──►  │ Agent Zero
                    │ polls Zulip    A2A   │ Docker container
                    │ port 8001            │
                    └──────────────────────┘

- adapter.py: Zulip event queue poller + A2A client
- No intermediate bridge — direct kagentz ↔ Zulip
- Heartbeat, reconnection, placeholder→edit streaming
- Designed for re-use: scottdenya, future Agent Zero agents

agent-zero-zulip/README.md

@@ -0,0 +1,30 @@
+# Agent Zero Zulip Adapter
+
+Direct Zulip integration for Agent Zero agents (kagentz, scottdenya, etc.).
+Each agent gets its own Zulip bot. Uses A2A protocol internally to
+communicate with Agent Zero's native A2A server.
+
+## Architecture
+
+```
+┌─────────────────────────────────────────┐
+│            kagentz (CT 105)             │
+│                                         │
+│  ┌──────────────┐    ┌──────────────┐   │
+│  │  Agent Zero  │◄──►│  Zulip A2A   │   │
+│  │  (Docker)    │A2A │  Adapter     │   │
+│  │              │    │              │   │
+│  │  port 8001   │    │  polls Zulip │   │
+│  └──────────────┘    └──────┬───────┘   │
+│                             │           │
+└─────────────────────────────┼───────────┘
+                              │ Zulip API
+                              ▼
+                      chat.sysloggh.net
+```
+
+## Components
+
+- `adapter.py` — Zulip event queue poller + A2A client
+- `agent_card.py` — Agent Card for A2A discovery
+- `Dockerfile` or `requirements.txt` for dependencies