Implement cross-platform process cleanup handlers for LSP servers.
Added registerProcessCleanup() method to LSPServerManager that:
- Kills all spawned LSP server processes on process.exit
- Handles SIGINT (Ctrl+C) - all platforms
- Handles SIGTERM (kill signal) - Unix/macOS/Linux
- Handles SIGBREAK (Ctrl+Break) - Windows specific
This prevents LSP servers from becoming orphan processes when opencode terminates unexpectedly.
🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
- Add diagnosticsStore to capture Push model notifications
- Handle textDocument/publishDiagnostics notifications in processBuffer
- Fix workspace/configuration response for JSON LSP validation
- Add missing language mappings (json, html, css, sh, fish, md, tf)
- diagnostics() now tries Pull first, falls back to Push store
- Add LSPServerManager for connection pooling with idle cleanup
- Add lsp_prepare_rename and lsp_rename tools
- Add lsp_code_actions and lsp_code_action_resolve tools
- Add WorkspaceEdit types and applyWorkspaceEdit utility
- Improve LSP client robustness with stderr buffering and process state tracking
