Add embedded MCP server with shared API facade

scripts/mcp-runner.js

@@ -0,0 +1,41 @@
+const { spawn } = require('child_process')
+const path = require('path')
+const electronBinary = require('electron')
+
+const rootDir = path.resolve(__dirname, '..')
+const entry = path.join(rootDir, 'dist-electron', 'mcp.js')
+
+const child = spawn(electronBinary, [entry], {
+  cwd: rootDir,
+  env: {
+    ...process.env,
+    ELECTRON_RUN_AS_NODE: '1'
+  },
+  stdio: ['pipe', 'pipe', 'pipe'],
+  windowsHide: true
+})
+
+if (process.stdin) {
+  process.stdin.pipe(child.stdin)
+}
+
+if (child.stdout) {
+  child.stdout.pipe(process.stdout)
+}
+
+if (child.stderr) {
+  child.stderr.pipe(process.stderr)
+}
+
+child.on('exit', (code, signal) => {
+  if (signal) {
+    process.kill(process.pid, signal)
+    return
+  }
+  process.exit(code ?? 0)
+})
+
+child.on('error', (error) => {
+  process.stderr.write(`[CipherTalk MCP Runner] failed: ${String(error)}\n`)
+  process.exit(1)
+})