Move Effect diagnostics to Oxlint

[omegent-app]

Why

Effect diagnostics currently run through the TypeScript language-service patch, while Oxlint is already the repository lint engine. This makes diagnostics differ between editor/compiler and lint workflows.

What

Enable the @effect/tsgo Oxlint integration with type-aware linting, migrate the configured Effect diagnostic severities to Oxlint rules, and disable diagnostics in the language-service plugin. Keep the existing TypeScript 6 / tsgo compiler path unchanged.

The Oxlint upgrade also applies safe type-aware fixes for assertions that the compiler can prove unnecessary.

How

Patch only Oxlint during prepare with effect-tsgo patch --no-typescript --oxlint. The language-service plugin remains installed but runs with diagnostics: false.

Pragmatic fit: preserve the customized compiler setup and move diagnostics only. Greenfield ideal: adopt @effect/tsgo for both compiler and lint once the remaining compiler customization can be retired; this PR is the reversible diagnostics-first step.

Remarks

Internal tooling only; no flow, machine, or browser behavior changes.

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commit: ac64f29