Write schema to file

[Copilot]

This PR implements the functionality to output the generated OpenAPI schema to dist/schema.json and commit it to git.

Changes Made

• Modified src/main.ts: Added file system operations to write the generated schema to dist/schema.json instead of just logging to console
• Updated .gitignore: Changed from ignoring entire dist/ directory to dist/* with exception !dist/schema.json to allow the schema file to be tracked by git
• Added test coverage: Created src/__tests__/main.test.ts to verify the file writing functionality

Behavior

When running npm run generate, the tool now:

1. Generates the OpenAPI schema as before
2. Creates the dist/ directory if it doesn't exist
3. Writes the schema to dist/schema.json (7825 lines, ~237KB)
4. Confirms the file was written with a console message

The generated schema.json file is now tracked by git and will be committed with future schema updates.

Fixes #24.

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[abraham]

Run prettier format

[Copilot]

Run prettier format

Fixed in commit 5d34f9b. Ran prettier format to resolve code style issues in the modified files.