Passive LSP Diagnostics Collection

What: Automatic collection of diagnostics (errors, warnings, hints) from LSP servers and delivery as message attachments.

Details:

• LSP servers now send textDocument/publishDiagnostics notifications automatically
• Diagnostics are queued and attached to the next API request as lsp_diagnostics attachments
• Includes file URI, line ranges, severity levels (Error/Warning/Info/Hint), and diagnostic messages
• Handles multiple LSP servers with individual error tracking and retry logic
• New saveFile method added to LSP manager for textDocument/didSave notifications
• Evidence: Handler registration lUQ() at line 276542, diagnostic registration dUQ() at line 276467, severity mapper WR6() at line 276504, transformer FR6() at line 276518 in pretty-v2.0.34.js