fix: esbuild compiles JSDoc node-pty into node - pty; causing startup crash

Root cause: esbuild 0.27.3 misparses `node-pty` inside JSDoc comments as a
code expression `node - pty` (subtraction). This produces a bare
`ReferenceError: node is not defined` at app.asar/dist-electron/main.js:35
on startup.

Fixes:
- terminal-manager.ts: replace JSDoc block with line comments and remove all
  literal `node-pty` strings (reference docs/handover instead)
- build-electron.mjs: clean dist-electron/ before every build to prevent
  stale artifact contamination in app.asar

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/build-electron.mjs

@@ -24,6 +24,14 @@ function resolveStandaloneSymlinks() {
 }
 
 async function buildElectron() {
+  // Clean dist-electron/ before every build to prevent stale artifacts
+  // from leaking into app.asar (caused v0.34 crash on upgrade).
+  if (fs.existsSync('dist-electron')) {
+    fs.rmSync('dist-electron', { recursive: true });
+    console.log('Cleaned dist-electron/');
+  }
+  fs.mkdirSync('dist-electron', { recursive: true });
+
   const shared = {
     bundle: true,
     platform: 'node',