feat: use bun as package manager and script/test runner

[thedanchez]

Summary

This PR migrates project to use bun as the primary tool for:

• package management (replacing npm / pnpm / yarn)
• script runner (replacing npm / pnpm / yarn)
• test runner via bun:test (replacing mocha / chai / ts-node)

Additionally, this PR:

• updates GitHub CI workflow to use bun (instead of yarn)
• updates TypeScript to latest version
• Removes unnecessary Makefile that was a proxy for running node_module binary scripts (move that responsibility to package.json where it belongs)

For the uninitiated, bun is an all-in-one JS toolchain. Moreover, it natively understands TypeScript which allows you to run any TS module without requiring transpilation (e.g. bun run module.ts). As a result of using bun, tests run an order of magnitude faster.

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Note

Replaces Mocha/Chai with bun:test and updates all assertions to Bun’s expect API.

• Testing:
  • Migrate test suite from mocha/chai to bun:test across all specs.
  • Replace Chai assertions with Bun/Jest-style expect APIs (e.g., toEqual, toBeGreaterThanOrEqual, not.toBeUndefined, toThrow).
  • Remove Mocha/Chai imports and adapt lifecycle hooks (beforeEach, describe, it) from bun:test.

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