LSP Workspace Initialization

What: LSP servers now receive proper workspace root information during initialization instead of null values.

Details:

• Changed rootPath from null to actual workspace folder path in LSP initialize request at x$Q() at line 283755
• Changed rootUri from null to file:// URI of workspace folder at line 283756
• Improves backward compatibility with LSP servers that rely on deprecated rootPath/rootUri fields
• Evidence: x$Q() at line 283750-283756

Why it matters: Some language servers use the deprecated rootPath and rootUri fields for workspace detection. Providing actual values instead of null improves compatibility with older LSP implementations.