Adopt Oxc lint and format tooling for MCP and root

[BYK]

Summary

• Adopt Oxlint and Oxfmt for MCP and root files while preserving CLI Biome, its Grit rules, and staged-file checks.
• Keep Oxlint’s default correctness plugins enabled alongside accessibility rules. Use Oxc’s shipped language server for root/MCP editor formatting and fixes; document CLI’s separate Biome formatting path.
• Add regressions for plugin and editor settings. Fix the terminal animation’s keyboard replay on its final step, with a regression that fails before the fix and when the guard is removed.
• Preserve the intentional ASCII-control token-padding check with a narrow lint suppression.

Validation

• Root script tests: 30 passed. Toolkit-core tests: 3 passed. Cloudflare tests: 433 passed across 34 files. Combined-tree typecheck, lint, docs links, and Oxfmt checks passed.
• The local root pnpm run test reached the 15-minute limit during the CLI suite; no passing aggregate result is claimed. Exact-head CI runs the workspace tests independently.

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Stale Bugbot comment from a previous run.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

There are 2 total unresolved issues (including 1 from previous review).

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