feat: /zulip-test command + standardized health schema v1

- Added /zulip-test self-test command (7 checks: queue, identity,
  @all-bots, health, poll loop, echo prevention, API send)
- Standardized health endpoint to zulip-health/v1 schema
  (nested zulip{} object, checks{} map, platform/agent metadata)
- Saved pi extension source to pi-zulip-extension/extension-src/
  (with all fixes: dynamic @all-bots, health sync, logging)
- Added extension src to repo for deployment tracking
- Updated vault with final contract status report

pi-zulip-extension/extension-src/config.yaml.example

@@ -0,0 +1,24 @@
+# pi Zulip extension — Abiba configuration (flat format for custom parser)
+# Deploy to: ~/.pi/agent/extensions/config.yaml
+
+zulip.site: https://chat.sysloggh.net
+zulip.email: abiba-bot@chat.sysloggh.net
+zulip.api_key: YOUR_ZULIP_API_KEY_HERE
+zulip.stream: agent-hub
+zulip.all_bots_user_id: 20
+
+agent.name: abiba
+agent.display_name: Abiba
+agent.zulip_bot_name: abiba-bot
+agent.owner_email: jerome@sysloggh.com
+agent.private_topic: abiba
+
+health_port: 9200
+
+monitoring.health_endpoint_enabled: true
+monitoring.log_level: info
+
+error_handling.timeout_seconds: 30
+error_handling.retry_count: 3
+error_handling.retry_delay_seconds: 5
+error_handling.graceful_message: "Abiba encountered an error processing your request. Please try again later."

pi-zulip-extension/extension-src/types.d.ts

@@ -0,0 +1,34 @@
+// Type declarations for zulip-js (no @types available)
+declare module "zulip-js" {
+  interface ZulipClient {
+    queues: {
+      register(params: {
+        event_types: string[];
+        narrow?: Array<Array<string | number>>;
+      }): Promise<{ queue_id: string; last_event_id: number }>;
+    };
+    users: {
+      me: {
+        get(): Promise<any>;
+      };
+    };
+    messages: {
+      store: {
+        send(rawContent: string): Promise<any>;
+      };
+    };
+    events: {
+      retrieve(params: {
+        queue_id: string;
+        last_event_id: number;
+        dont_block?: boolean;
+      }): Promise<{ events: any[]; result?: string; msg?: string }>;
+    };
+  }
+
+  export default function zulip(config: {
+    username: string;
+    apiKey: string;
+    realm: string;
+  }): Promise<ZulipClient>;
+}