Multi-language check sets (TypeScript, Go)

[wimaan3]

Problem

Only Python is implemented. The uniform check contract already supports per-language sets (ADR-0015); add real ones.

Scope

• checks/typescript/ and checks/go/ behind the same contract (build/format/lint/typecheck/test/security).
• Validate via a sample project of each language.

Acceptance criteria

• A TS project and a Go project pass the gate using their check sets.
• Docs for adding a language.

Refs: ADR-0015, ROADMAP "Multi-language stacks".