chore(deps): bump @agentclientprotocol/sdk from 0.18.0 to 0.19.0 in /sdk

Bumps [@agentclientprotocol/sdk](https://github.com/agentclientprotocol/typescript-sdk) from 0.18.0 to 0.19.0.
- [Release notes](https://github.com/agentclientprotocol/typescript-sdk/releases)
- [Changelog](https://github.com/agentclientprotocol/typescript-sdk/blob/main/CHANGELOG.md)
- [Commits](agentclientprotocol/typescript-sdk@v0.18.0...v0.19.0)

---
updated-dependencies:
- dependency-name: "@agentclientprotocol/sdk"
  dependency-version: 0.19.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

sdk/package.json

@@ -72,7 +72,7 @@
     "docs": "typedoc"
   },
   "dependencies": {
-    "@agentclientprotocol/sdk": "0.18.0"
+    "@agentclientprotocol/sdk": "0.19.0"
   },
   "peerDependencies": {
     "@anthropic-ai/claude-agent-sdk": ">=0.2.90",