🤖 fix: set TERM_PROGRAM and disable problematic zsh features

- Set TERM_PROGRAM=cmux to identify embedded terminal
- Set DISABLE_AUTO_TITLE=true to prevent title escape sequences
- Set ZSH_AUTOSUGGEST_STRATEGY=history for simpler completions
- Reduces rendering issues with complex zsh plugins/prompts

User can detect cmux terminal in .zshrc with:
  if [[ $TERM_PROGRAM == 'cmux' ]]; then
    # Use simpler prompt/plugins
  fi

_Generated with `cmux`_

Author: sreya

src/services/ptyService.ts

@@ -70,6 +70,10 @@ export class PTYService {
         env: {
           ...process.env,
           TERM: "xterm-256color",
+          TERM_PROGRAM: "cmux",
+          // Disable problematic zsh features for embedded terminal
+          DISABLE_AUTO_TITLE: "true",
+          ZSH_AUTOSUGGEST_STRATEGY: "history", // Simpler completion
         } as Record<string, string>,
       });