chore(lint): Use shared eslint config

[fb55]

No description provided.

[Copilot]

Pull request overview

This PR updates the repository’s linting/formatting setup to use a shared ESLint flat config (via @feedic/eslint-config) and introduces Biome for additional lint/format checks.

Changes:

• Migrate from legacy .eslintrc.json to eslint.config.mjs (flat config) using the shared @feedic/eslint-config.
• Add biome.json and update package.json scripts/dependencies to run ESLint + Biome (and remove Prettier usage).
• Minor source adjustment in src/index.ts to satisfy updated lint rules.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/index.ts	Rename isTag param and add a scoped ESLint suppression around backwards-compat exports.
package.json	Update scripts and devDependencies for ESLint v10 + shared config + Biome; remove Prettier workflow.
eslint.config.mjs	Add ESLint flat config wiring in shared config, TypeScript rules, and ignore handling.
biome.json	Add Biome configuration for formatting/linting and overrides.
.prettierignore	Remove Prettier ignore file (Prettier no longer used).
.eslintrc.json	Remove legacy ESLint config (replaced by flat config).

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