chore(nx): migrate workspace to Nx 23.1

[kattsushi]

Pre-flight checks

• Existing open issues were searched and this is not a duplicate.
• This issue must be approved before opening its pull request.

Problem

The workspace is pinned to Nx 23.0.1 while Nx 23.1.0 provides the current supported package set, TypeScript 6 compatibility migrations, and fixes required to keep the monorepo tooling aligned.

Proposed change

• Upgrade nx and all first-party @nx/* packages from 23.0.1 to 23.1.0.
• Apply the generated Nx migrations.
• Align TypeScript with the migrated Nx configuration.
• Preserve the existing Effect tsgo integration.
• Validate all affected lint, typecheck, and test targets.

Acceptance criteria

• pnpm nx report reports Nx 23.1.0 consistently.
• pnpm nx sync succeeds.
• Affected lint, typecheck, and test targets pass.
• Publishable package versions are not changed.
• No release or publication is performed.

Review-size exception

This is a single generated migration work unit. The lockfile and Nx-generated TypeScript configuration updates cannot be split safely without creating intermediate states that do not represent a valid migrated workspace. The maintainer explicitly approved one PR despite the diff exceeding 400 lines.

[kattsushi]

Completed by merged PR #80 and superseded by the verified Nx 23.1.1 alignment in merged PR #153.