Fix Installation Circular Dependency Issue

[AmmarFahmy]

Fix Installation Circular Dependency Issue

Problem

When running yarn install, users encounter a circular dependency error because the @opencanvas/agents package tries to run yarn turbo build during installation via its postinstall script. This creates a circular dependency since:

1. The postinstall script tries to use Turbo to build the package
2. But Turbo itself isn't fully available during the installation process
3. This results in a "Cannot find module 'turbo'" error that blocks installation

Solution

This PR fixes the installation process by:

1. Removing the problematic postinstall script from apps/agents/package.json that was causing the circular dependency
2. Updating the main README.md to include an explicit yarn build step after installation
3. Ensuring the build process is run manually after dependency installation instead of during the installation itself

This breaks the circular dependency chain and allows for a smooth installation experience for new contributors.

Changes

• Removed the postinstall script from apps/agents/package.json
• Updated README.md to add the explicit build step after yarn install

These changes ensure that Open Canvas can be installed without errors and maintains a clear, straightforward setup process for new users.

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