Browser bundle includes TypeScript runtime in validation/LSP path

[shahabdsh]

Summary

Browser bundling of @xlr-lib/xlr-sdk includes TypeScript runtime code, even though this layer should avoid shipping TS compiler/runtime in browser-targeted bundles.

Expected

Browser bundle excludes TypeScript runtime.

Actual

Bundle contains TS runtime markers:

• /typescript/lib/typescript.js
• getDefaultLibFileName
• Compiler_option_0_of_value_1_is_unstable

Repro

1. Checkout branch: repro/lsp-bundles-typescript-xlr
2. Run:
   pnpm vitest sdk/src/__tests__/bundle-hygiene.test.ts
3. Observe failing test due to TS runtime markers in browser bundle.

Repro branch

• URL: https://github.com/shahabdsh/xlr/tree/repro/lsp-bundles-typescript-xlr
• Commit: 2965b38