feat: add cname-prefix package

[nd0ut]

Description

Checklist

• Tests (if applicable)
• Documentation (if applicable)
• Changelog stub (or use conventional commit messages)

[Copilot]

Pull Request Overview

This PR introduces a new cname-prefix package and aligns testing dependencies across the monorepo.

• Bumps Vitest and coverage tooling in image-shrink
• Adds packages/cname-prefix with its source code, tests, build/config files, and documentation
• Updates root package.json and CI workflow to include the new package

Reviewed Changes

Copilot reviewed 20 out of 27 changed files in this pull request and generated 2 comments.

File	Description
packages/image-shrink/package.json	Upgraded Vitest from v1 to v3 and replaced coverage-istanbul
packages/cname-prefix/…	All new config, source, tests, and build files for package
package.json	Included packages/cname-prefix in the workspace
.github/workflows/checks.yml	Added cname-prefix paths to the CI job triggers

Comments suppressed due to low confidence (1)

packages/cname-prefix/README.md:39

• Since getCnamePrefix is async, the usage example should await the call (const prefix = await getCnamePrefix(...)) or handle the returned Promise to avoid confusion.

const prefix = getCnamePrefix('demopublickey')

[Copilot]

The version in version.ts ('6.2.1') does not match the package.json version ('6.14.3'), leading to inconsistent versioning. Please synchronize them.

Suggested change

	export default '6.2.1'
	export default '6.14.3'

[Copilot]

Using parseInt on a full 256-bit hex string will exceed JavaScript's Number safe range, causing precision loss. Consider using BigInt('0x' + hashHexStr) or returning the hex string directly to preserve the full value.

Suggested change

	export const sha256Encode = async (data: string): Promise<number> => {
	const msgUint8 = new TextEncoder().encode(data)
	const hashBuffer = await window.crypto.subtle.digest('SHA-256', msgUint8)
	const hashArray = Array.from(new Uint8Array(hashBuffer))
	const hashHexStr = hashArray
	.map((b) => b.toString(16).padStart(2, '0'))
	.join('')
	const hashHexInt = parseInt(hashHexStr, 16)
	export const sha256Encode = async (data: string): Promise<bigint> => {
	const msgUint8 = new TextEncoder().encode(data)
	const hashBuffer = await window.crypto.subtle.digest('SHA-256', msgUint8)
	const hashArray = Array.from(new Uint8Array(hashBuffer))
	const hashHexStr = hashArray
	.map((b) => b.toString(16).padStart(2, '0'))
	.join('')
	const hashHexInt = BigInt('0x' + hashHexStr)