chore(lint): Use shared eslint config

[fb55]

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[Copilot]

Pull request overview

This PR migrates the repo’s lint/format tooling to a shared ESLint flat-config and introduces Biome, removing the legacy .eslintrc.json/Prettier setup.

Changes:

• Replace legacy ESLint config files with eslint.config.mjs using @feedic/eslint-config and ESLint v10.
• Add Biome configuration and scripts; remove Prettier config/ignore file usage.
• Apply small naming/loop refactors in source and tests to satisfy updated lint rules.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/index.ts	Renames parameters to satisfy lint rules (public API surface via generated typings).
src/index.spec.ts	Updates callback param naming and replaces forEach with for...of.
package.json	Switches scripts/tooling deps to ESLint v10 + Biome; removes Prettier.
package-lock.json	Lockfile update for new lint/format dependency graph.
eslint.config.mjs	New ESLint flat-config using shared config + TS rules.
biome.json	New Biome formatter/linter configuration.
.prettierignore	Removed (Prettier no longer used).
.eslintrc.json	Removed (migrated to flat config).
.eslintignore	Removed (ignore handling moved to gitignore/flat config).

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