Add Messaging interface, with Slack tool and Messaging Tasks agent

Author: KrisBraun

.changeset/loose-baboons-sit.md

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+---
+"@plotday/agent": minor
+---
+
+Added: Common Messaging interface
+Added: Provider-specific, verified webhooks

.changeset/true-areas-pull.md

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+---
+"@plotday/tool-outlook-calendar": patch
+"@plotday/tool-google-calendar": patch
+---
+
+Changed: Updated builder

agents/message-tasks/package.json

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+{
+  "name": "@plotday/agent-message-tasks",
+  "plotAgentId": "0193c8a0-0000-7000-8000-000000000001",
+  "displayName": "Message Tasks",
+  "description": "Create tasks from actionable message threads",
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "sideEffects": false,
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "deploy": "plot deploy",
+    "lint": "plot lint",
+    "logs": "plot logs"
+  },
+  "dependencies": {
+    "@plotday/agent": "workspace:^",
+    "@plotday/tool-slack": "workspace:^",
+    "typebox": "^1.0.35"
+  },
+  "devDependencies": {
+    "typescript": "^5.9.3"
+  }
+}