chore(lint): Use shared eslint config

[fb55]

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[Copilot]

Pull request overview

Updates the project’s linting/formatting setup to use a shared ESLint config and Biome, with resulting import/order formatting changes across source and test files.

Changes:

• Switched ESLint configuration to @feedic/eslint-config and trimmed local rule definitions.
• Replaced Prettier formatting scripts/config with Biome (biome.json, new npm scripts).
• Applied formatting/import-order updates across TS sources/tests; changed const enum to runtime enum in the tokenizer.

Reviewed changes

Copilot reviewed 14 out of 15 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/index.ts	Reorders exports/imports to match new lint/format rules.
src/index.spec.ts	Import ordering and Promise construction formatting updates.
src/fixtures/testHelper.ts	Import ordering update.
src/WritableStream.ts	Import ordering update.
src/WritableStream.spec.ts	Import ordering update.
src/Tokenizer.ts	Converts const enum to enum to satisfy lint/format constraints.
src/Tokenizer.spec.ts	Import ordering update.
src/Parser.ts	Import ordering update.
src/Parser.spec.ts	Import ordering update.
src/Parser.events.spec.ts	Import ordering update.
src/FeedHandler.spec.ts	Import ordering update.
package.json	Swaps Prettier for Biome scripts; adopts shared ESLint config dependency.
eslint.config.mjs	Replaces local flat config with shared @feedic/eslint-config and common TS rules.
biome.json	Adds Biome configuration for formatting/linting/import organization.

Comments suppressed due to low confidence (1)

eslint.config.mjs:1

• This config still references n/* and unicorn/* rules, but eslint-plugin-n and eslint-plugin-unicorn were removed from package.json. Unless @feedic/eslint-config provides (and registers) these plugins, ESLint will error with 'Definition for rule ... was not found'. Either re-add the plugins as devDependencies/ensure they’re included as dependencies, or remove these plugin-specific rule overrides.

import { defineConfig } from "eslint/config";

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