Keep daemon logs after a button restart

poc/src/control-bridge.ts

@@ -10,6 +10,7 @@
  */
 
 import { spawn } from "node:child_process";
+import { closeSync, openSync } from "node:fs";
 import { config as loadEnv } from "dotenv";
 import { createMcpExpressApp } from "@modelcontextprotocol/sdk/server/express.js";
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
@@ -1051,14 +1052,18 @@ function restartDaemon(): void {
     const args = [...process.execArgv, ...process.argv.slice(1)];
     const command = `${quote(process.execPath)} ${args.map(quote).join(" ")}`;
 
-    console.log("[daemon] restart requested: spawning a replacement");
+    const logPath = process.env.VESKSLOP_DAEMON_LOG ?? join(dirname(tokenFile), "daemon.log");
+    console.log(`[daemon] restart requested: spawning a replacement, appending to ${logPath}`);
+
+    const logFd = openSync(logPath, "a");
     const child = spawn("sh", ["-c", `sleep 2; exec ${command}`], {
         detached: true,
-        stdio: "ignore",
+        stdio: ["ignore", logFd, logFd],
         cwd: process.cwd(),
         env: { ...process.env, VESKSLOP_DAEMON_RESTART: "1" }
     });
     child.unref();
+    closeSync(logFd);
 
     setTimeout(() => shutdown(true), 300);
 }