feat: initial stable release v1.0.0

[grrtbrtr]

Overview

This PR merges the complete initial implementation from dev to main for the official v1.0.0 release. The tool is now a fully functional, zero-dependency CLI for identifying schema drift and missing keys across multiple JSON files.

Features

• Deep comparison: Recursively traverses objects to find missing keys at any nesting level.
• Compare many files: Compares 2 or more files, using the union of all keys as the "master" schema.
• Per-file reports: Aggregates all unique keys and tells you exactly what is missing from each file.
• Zero dependencies: Built with pure Node.js.

CI/CD

• Unit Tests: Full coverage for core logic and deep-merging utilities.
• GitHub Actions: CI pipeline configured and passing on Node 20+.
• Security: Zero external dependencies.
• Automation: prepublishOnly hooks integrated into package.json.