build: TypeScript 6 + use oxc.rs for linting and formatting

[erickzhao]

• This repo didn't have ESLint configured at all. I instantiated a clean oxlint instance here.
• Since we're linting against oxlint-tsgolint, let's upgrade to TypeScript 6 to bridge the gap to v7.
• Ignoring Markdown in the config because we previously wanted to do that with Prettier cc @dsanders11

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	oxfmt@​0.42.0
	oxlint@​1.57.0
	oxlint-tsgolint@​0.18.1

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[socket-security]

All alerts resolved. Learn more about Socket for GitHub.

This PR previously contained dependency changes with security issues that have been resolved, removed, or ignored.

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[erickzhao]

@SocketSecurity ignore npm/entities@4.5.0
@SocketSecurity ignore npm/markdown-it@14.1.1