Standardization foundation (Pillar A):
- Prettier (.prettierrc.json, .prettierignore) + `format`/`format:check`
scripts; style tuned to the house style (single quotes, semicolons,
2-space, printWidth 100).
- .editorconfig for editor-level consistency.
- Extend the flat ESLint config to lint server `.cts` (Node globals, TS
parser, "focused signal" rule set mirroring the client) so `eslint .`
now covers both halves; `lint` → `eslint .`.
- Wire `format:check` into the `ci` script.
`npm run lint` is green (0 errors; pre-existing intentional patterns kept
as advisory warnings to ratchet later).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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