chore: add anti-slop Oxlint rules

[mattzcarey]

Summary

• vendor the generic and Effect anti-slop Oxlint plugins under tools/oxlint/anti-slop
• pin matching oxlint and @oxlint/plugins 1.80.0 releases and register the plugins in the normal root lint configuration
• enable six generic rules plus the Effect service-import rule, with narrow file overrides for existing proxy, prototype-call, and module-mocking cases
• keep high-volume migration rules explicitly disabled and document the initial findings and rationale in tools/oxlint/anti-slop/README.md
• preserve the existing React lint policy across the Oxlint upgrade, add formatter/tooling ignores, and record the vendored MIT license
• fix several tractable findings in Agents, Think, and Voice code and tests

A strict initial scan found 13,205 existing anti-slop findings across 824 files. This PR enables the rules the repository can adopt cleanly now. The remaining rules stay visible as off rather than disappearing from the configuration, so they can be migrated package by package.

No changeset is included because this changes repository tooling and internal implementation details without changing package behavior or public APIs.

Verification

• pnpm run build
• pnpm run check with Node 24.14.1, including all 114 TypeScript projects
• pnpm exec nx affected -t test, covering 22 affected projects
• focused Agents, Think, Voice, and Plivo tests
• temporary violating-file smoke test confirming an enabled anti-slop rule rejects code through the normal root configuration

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Latest commit: 9fa430a

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