Replace ESLint + Prettier with Biome#419
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Biome is a single Rust binary that handles both linting and formatting, eliminating the ESLint plugin ecosystem churn that caused recurring major-version upgrade failures (e.g. ESLint 9→10 removing the --ext flag in PR #418). - Add biome.json (migrated from eslint.config.mjs + .prettierrc.json via biome migrate) - Remove eslint.config.mjs, .prettierrc.json, .prettierignore - Remove 10 ESLint/Prettier devDependencies, keep only @biomejs/biome - Update scripts: format/lint/check now use biome; `all` uses `biome check` - Reformat source files to Biome's output (same style rules: no semis, single quotes, 80-col) - Import order sorted by Biome's assist/organizeImports Unsupported ESLint rules dropped (no Biome equivalent yet): await-thenable, consistent-type-assertions, no-unnecessary-type-assertion, prefer-includes, promise-function-async, unbound-method, require-array-sort-compare https://claude.ai/code/session_016jW1nwSWix68aM6xsARjNo
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Biome is a single Rust binary that handles both linting and formatting,
eliminating the ESLint plugin ecosystem churn that caused recurring major-version
upgrade failures (e.g. ESLint 9→10 removing the --ext flag in PR #418).
allusesbiome checkUnsupported ESLint rules dropped (no Biome equivalent yet):
await-thenable, consistent-type-assertions, no-unnecessary-type-assertion,
prefer-includes, promise-function-async, unbound-method, require-array-sort-compare
https://claude.ai/code/session_016jW1nwSWix68aM6xsARjNo