Evaluate upgrade: TypeScript 5.9.3 → 6.0.2 (major version bump) #152

Major Version Upgrade Evaluation

Package: typescript
From: 5.9.3 → To: 6.0.2
Dependabot PR: #143 (dev-deps group, also bumps biome, @types/node, turbo, vitest)
CI Status: ✅ Passing

Why human review

TypeScript major versions can introduce stricter type checking, deprecate compiler options, and change module resolution. CI passes, but subtle type-level changes may not surface until downstream consumers rebuild.

Assessment Needed

• Review TS 6.0 release notes for breaking changes
• Check biome/vitest/turbo TS 6 support
• Verify downstream orgloop modules still build cleanly

Auto-created by patrol agent (Dependabot Triage, Category C — major version bump)