refactor(core): extract shared dedup helpers

src/agents/pi-tool-handler-state.test-helpers.ts

@@ -0,0 +1,15 @@
+export function createBaseToolHandlerState() {
+  return {
+    toolMetas: [] as Array<{ toolName?: string; meta?: string }>,
+    toolSummaryById: new Set<string>(),
+    lastToolError: undefined,
+    pendingMessagingTexts: new Map<string, string>(),
+    pendingMessagingTargets: new Map<string, unknown>(),
+    pendingMessagingMediaUrls: new Map<string, string[]>(),
+    messagingToolSentTexts: [] as string[],
+    messagingToolSentTextsNormalized: [] as string[],
+    messagingToolSentMediaUrls: [] as string[],
+    messagingToolSentTargets: [] as unknown[],
+    blockBuffer: "",
+  };
+}