chore: rename package to gitcontext for npm registry publishing

[utkarsh232005]

Summary

The unscoped package name git-context is already claimed and owned on npm registry by another maintainer (om-ghante), resulting in an E403 Forbidden error during workflow publication.

This PR renames the npm package to gitcontext (which is verified available on npm):

• Updates package.json name to gitcontext
• Preserves both gitcontext and git-context as binary command aliases in package.json#bin
• Updates installation instructions in README.md
• Tested with npm pack --dry-run and full test suite (npm run check, all 63 tests passing)

Summary by CodeRabbit

• New Features

  • The gitcontext command is now available as an additional way to run the CLI. The existing git-context command remains available.
  • The package name is now gitcontext.

• Documentation

  • Installation instructions now use the gitcontext package name.

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📥 Commits

Reviewing files that changed from the base of the PR and between 9f059b0 and 8c18943.

📒 Files selected for processing (2)

• README.md
• package.json

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< DRY - Don't Repeat Yourself. Every piece of knowledge must have a single, unambiguous, authoritative representation within a system. >
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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create a new PR

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