feat: add server control commands (disable, enable, destroy)

Add /lsp-servers, /lsp-disable, /lsp-enable, and /lsp-destroy TUI commands.
Disabled servers are tracked in-memory per-extension-instance; the shared
daemon is never mutated by disable/enable. When all servers are disabled,
LSP tools are removed from the active tool set so the LLM won't attempt them.

Also adds a destroy_server daemon operation that kills running LspClient
entries by server ID or all entries.

src/daemonClient.ts

@@ -43,3 +43,11 @@ export async function daemonStatus(): Promise<unknown> {
 export async function daemonShutdown(): Promise<unknown> {
   return unwrap(await sendOnce({ op: "shutdown" }));
 }
+
+// Destroy Server - Kills running LspClient entries matching a server ID,
+// or all entries if no ID is given. Entries can respawn on next request.
+export async function daemonDestroyServer(
+  serverId?: string,
+): Promise<unknown> {
+  return unwrap(await sendOnce({ op: "destroy_server", serverId }));
+}