Improve n4s schema inference types

[ealush]

Summary

• simplify schema schema inference by extracting rule outputs from the infer property and flattening required/optional mappings
• clean up schema rule helpers to use explicit generic constraints and remove stale annotations

Testing

• yarn test run (fails: local workspace build tooling cannot resolve vest-utils during vitest run)
• npx tsc -p packages/vest/tsconfig.json --noEmit (fails: workspace path aliases such as 'vest-utils' are not resolved in this environment)
• npx tsc -p packages/n4s/tsconfig.json --noEmit (fails: workspace references require build artifacts that are unavailable in this environment)
• yarn build (cancelled after partial execution to avoid rebuilding all workspace packages)

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Codex Task

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
vest	Error			Nov 15, 2025 7:00pm
vest-next	Error			Nov 15, 2025 7:00pm