NPM package version bump

[robgruen]

This pull request updates the TypeChat package to improve its npm publishing workflow and package configuration. The most significant changes include adding scripts to handle the SECURITY.md file during publish, updating .npmignore to exclude unnecessary files, and incrementing the package version.

NPM publishing workflow improvements:

• Added prepublishOnly and postpublish scripts in package.json to copy SECURITY.md into the package before publishing and remove it afterward, ensuring the file is included in the published package but not left in the working directory.
• Updated .gitignore in node_modules/typescript/ to note that SECURITY.md is copied at publish time.

Package configuration updates:

• Added a .npmignore file to exclude source files, examples, node_modules, TypeScript files, and other development artifacts from the published package, while ensuring type declarations are included.
• Set the main and types fields in package.json to point to the built files in dist/, improving compatibility for consumers.
• Bumped the package version from 0.1.1 to 0.1.2 in package.json. Available: https://www.npmjs.com/package/typechat/v/0.1.2

Repository metadata:

• Updated the repository URL in package.json to use the git+https protocol for better npm compatibility.