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>

electron/terminal-manager.ts

@@ -12,21 +12,16 @@ interface TerminalInstance {
   cwd: string;
 }
 
-/**
- * TerminalManager — manages terminal processes.
- *
- * KNOWN LIMITATION: Uses child_process.spawn with stdio: 'pipe' instead of
- * a real PTY (node-pty). This means:
- *  - resize() is a no-op (COLUMNS/LINES env vars are set at creation only)
- *  - Full-screen programs (vim, htop) won't render correctly
- *  - readline line-editing may behave differently
- *
- * TODO: Upgrade to node-pty for full PTY support. Requires:
- *  1. npm install node-pty
- *  2. scripts/after-pack.js: add node-pty to rebuild list
- *  3. electron-builder.yml: add "**/node-pty/**" to asarUnpack
- *  4. scripts/build-electron.mjs: add node-pty to esbuild externals
- */
+// TerminalManager — manages terminal processes.
+//
+// KNOWN LIMITATION: Uses child_process.spawn with stdio: 'pipe' instead of
+// a real PTY. This means:
+//  - resize() is a no-op (COLUMNS/LINES env vars are set at creation only)
+//  - Full-screen programs (vim, htop) won't render correctly
+//  - readline line-editing may behave differently
+//
+// TODO: Upgrade to a real PTY library for full support. See
+// docs/handover/git-terminal-layout.md for the 4-step upgrade path.
 export class TerminalManager {
   private terminals = new Map<string, TerminalInstance>();
   private onData: ((id: string, data: string) => void) | null = null;
@@ -94,7 +89,7 @@ export class TerminalManager {
   // eslint-disable-next-line @typescript-eslint/no-unused-vars
   resize(id: string, _cols: number, _rows: number): void {
     // With spawn (non-PTY), resize is a no-op.
-    // Would use pty.resize() with node-pty.
+    // Would use pty.resize() with a real PTY library.
   }
 
   kill(id: string): void {

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',