chore: add .prettierignore and apply Prettier formatting

Add packages/agent/.prettierignore to exclude dist/ from format checks
(root .prettierignore wasn't picked up when Prettier runs from the package dir).
Run prettier --write on source files changed in the previous commit.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: sharon77242

packages/agent/.prettierignore

@@ -0,0 +1,4 @@
+node_modules/
+dist/
+*.js.map
+coverage/

packages/agent/src/argus-agent.ts

@@ -474,9 +474,8 @@ export class ArgusAgent extends EventEmitter {
     if (this.globallyDisabled || this.running) return this;
 
     const debugEnv = process.env.ARGUS_DEBUG;
-    const debugEnabled = debugEnv !== undefined
-      ? debugEnv !== "false" && debugEnv !== "0"
-      : this.isDevMode;
+    const debugEnabled =
+      debugEnv !== undefined ? debugEnv !== "false" && debugEnv !== "0" : this.isDevMode;
     if (debugEnabled) {
       this.useConsoleLogger();
     }