feat: include ticket URL in task pickup announcements (#22)

- Add issue URL to announcement in dispatch.ts
- Add issueUrl field to workerStart notification event
- Update notification message to include URL
- Both automated notifications and manual announcements now show full ticket URL

Example output:
🔧 Spawning DEV (medior) for #7: Create TODO.md...
🔗 https://github.com/laurentenhoor/devclaw/issues/7

lib/dispatch.ts

@@ -266,7 +266,7 @@ export async function dispatchTask(
       ? "🔍"
       : "🔧";
   const actionVerb = sessionAction === "spawn" ? "Spawning" : "Sending";
-  const announcement = `${emoji} ${actionVerb} ${role.toUpperCase()} (${modelAlias}) for #${issueId}: ${issueTitle}`;
+  const announcement = `${emoji} ${actionVerb} ${role.toUpperCase()} (${modelAlias}) for #${issueId}: ${issueTitle}\n🔗 ${issueUrl}`;
 
   return {
     sessionAction,

lib/notify.ts

@@ -31,6 +31,7 @@ export type NotifyEvent =
       groupId: string;
       issueId: number;
       issueTitle: string;
+      issueUrl: string;
       role: "dev" | "qa";
       model: string;
       sessionAction: "spawn" | "send";
@@ -66,7 +67,7 @@ function buildMessage(event: NotifyEvent): string {
   switch (event.type) {
     case "workerStart": {
       const action = event.sessionAction === "spawn" ? "🚀 Started" : "▶️ Resumed";
-      return `${action} ${event.role.toUpperCase()} (${event.model}) on #${event.issueId}: ${event.issueTitle}`;
+      return `${action} ${event.role.toUpperCase()} (${event.model}) on #${event.issueId}: ${event.issueTitle}\n🔗 ${event.issueUrl}`;
     }
 
     case "workerComplete": {

lib/tools/task-pickup.ts

@@ -322,6 +322,7 @@ export function createTaskPickupTool(api: OpenClawPluginApi) {
           groupId,
           issueId: issue.iid,
           issueTitle: issue.title,
+          issueUrl: issue.web_url,
           role,
           model: dispatchResult.modelAlias,
           sessionAction: dispatchResult.sessionAction,