* chore: add prettier config and CI auto-formatter
Adds .prettierrc and .prettierignore (config only, no local enforcement).
Formatting runs in CI via the prettier.yml workflow: on every push to a
non-main branch, Prettier rewrites changed files and commits the result back
using GITHUB_TOKEN. Developers never need to run Prettier locally.
Intentionally excludes husky/lint-staged — local pre-commit hooks are the
wrong layer for a formatter that the whole team doesn't need installed.
Also adds .envrc.local to .gitignore for personal local shell overrides.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Entire-Checkpoint: 27336650d2ee
* chore: format with prettier [skip ci]
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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
yyovil