chore: migrate repo from Yarn to pnpm and add Biome CI

[GodPuffin]

Motivation

• Move the repository from Yarn to pnpm for a simpler, modern package workflow.
• Standardize formatting and linting by adopting Biome instead of the previous ESLint setup.
• Add CI to run the new quality checks automatically on push and pull requests.

Description

• Update package.json to packageManager: "pnpm@10.13.1", add format / biome:check scripts and lint mapped to Biome, add @biomejs/biome to devDependencies, and remove the old ESLint packages and an unused @types/uuid entry.
• Remove Yarn-specific artifacts (.yarnrc.yml, yarn.lock) and clean obsolete Yarn entries from .gitignore.
• Add a root biome.json that enables Biome formatter, linter, and import organization with basic formatting/lint settings.
• Add a GitHub Actions workflow .github/workflows/biome.yml that sets up pnpm and Node.js and runs pnpm biome:check, and update README.md to document pnpm usage and the note about generating pnpm-lock.yaml on first install.

Testing

• Ran git diff --check to ensure no whitespace or index errors and it succeeded.
• Validated JSON syntax by running node -e "JSON.parse(...)" on package.json and biome.json, which succeeded.
• Attempted pnpm install, but package fetches failed with 403 Forbidden from the environment proxy so pnpm-lock.yaml could not be generated (install failed).
• Attempted to run biome --version, but the Biome CLI is not available locally until dependencies can be installed, so Biome execution could not be validated in this environment.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
portfolio	Ready	Preview, Comment	Mar 19, 2026 1:02am