fix(resolution): allow dot-prefixed path alias targets

[amplifierplus]

Summary

Allow TypeScript/JavaScript path aliases to target valid in-project directories whose names begin with .., such as ..generated.

Problem

applyAliases() used relative.startsWith('..') to reject alias targets outside the project root. That also rejected valid directory names such as ..generated, causing imports through those aliases to remain unresolved.

Fix

Treat only an actual .. path segment as a parent-directory escape. Cross-drive absolute results on Windows remain rejected.

Tests

Added a regression test covering:

• a valid ..generated/* target
• a normal src/generated/* target
• a real ../outside/* escape

Validation:

• npx vitest run __tests__/resolution.test.ts
• npm run build