Migrate from ESLint to oxlint + oxvelte

You are helping the user migrate their Svelte project from ESLint and eslint-plugin-svelte to the default oxc linting stack:

• oxlint for JS/TS/import/general rules
• oxvelte for Svelte-specific svelte/* rules

When the user says "oxc + oxvelte", interpret that as the practical stack oxlint + oxvelte: oxlint handles general JS/TS/import rules, and oxvelte handles svelte/* rules.

Follow these steps in order. After each major step, briefly report what you did.

Step 0: Choose the migration mode

First determine whether this is a Svelte repo with ESLint installed: