Automate PR creation for dependency updates

[humanagent]

Implement automated updates for @xmtp/node-sdk to keep dependencies current and manage version aliases.

[macroscopeapp]

Automate PR creation for dependency updates by adding GitHub Actions workflow and update scripts for XMTP Node SDK

• Adds GitHub Actions workflow .github/workflows/update-xmtp-sdk.yml that runs daily at 9 AM UTC to check for new XMTP Node SDK versions, creates update branches with versioned aliases, updates corresponding node-bindings dependencies, and generates pull requests
• Creates Node.js update script scripts/update-xmtp-sdk.js that checks for SDK updates, determines corresponding node-bindings versions, updates package.json with versioned aliases, and runs compatibility tests
• Adds npm scripts check-updates:xmtp and update:xmtp to package.json for manual update operations
• Includes documentation files README-XMTP-Updates.md and docs/xmtp-sdk-updates.md explaining the automated update system and usage instructions

📍Where to Start

Start with the GitHub Actions workflow in .github/workflows/update-xmtp-sdk.yml to understand the automated update process, then review the update script in scripts/update-xmtp-sdk.js.

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Macroscope summarized 1e9e549.

[macroscopeapp]

In both updatePackageJson and the inline Node.js script in file:.github/workflows/update-xmtp-sdk.yml:113, accessing pkg.packageExtensions without ensuring it’s defined can throw a TypeError when it’s missing from package.json. Consider initializing it right after parsing, e.g.: pkg.packageExtensions = pkg.packageExtensions || {};.

+  pkg.packageExtensions = pkg.packageExtensions || {};

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