Add OSC 133 shell integration support across PowerShell, Bash, and CMD.exe

[Copilot]

• Understand OSC 133;D sequence requirements and placement
• Add OSC 133;D emission at the start of the prompt function (after capturing exit code, before OSC 133;A)
• Update documentation in README.md
• Verify the implementation works correctly
• Consolidate WT_SESSION/ConEmuPID conditionals in PowerShell profile
• Add OSC 133 shell integration support to git-prompt.sh (bash)
• Add OSC 133 shell integration support to cmd.exe PROMPT
• Refactor cmd.exe PROMPT to avoid duplication

Latest Changes

vendor/init.bat

• Refactored to define the base prompt once
• Windows Terminal integration now wraps the existing prompt using %PROMPT% variable
• Eliminates duplicate prompt definitions
• Cleaner, more maintainable code

The prompt is now set once with:

prompt $E[1;32;49m$P$S$_$E[1;30;49mλ$S$E[0m

Then conditionally wrapped when in Windows Terminal:

if defined WT_SESSION (prompt $e]133;D$e\$e]133;A$e\$e]9;9;$P$e\%PROMPT%$e]133;B$e\)

Original prompt

@copilot Can you also implement OSC 133 ; D ; <ExitCode> ST ("FTCS_COMMAND_FINISHED") too, for Windows Terminal?

See #3041 for the history of the other implemented OSC 133 codes.

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[Copilot]

@copilot Let's move all WT_SESSION/ConEmuPID parts under one conditional statement, instead of multiple ifs to make it cleaner.

Next, can you non intrusively modify the git-prompt.sh to support...

Done in commit 4d259ba.

Changes made:

1. Consolidated PowerShell conditionals - Merged all WT_SESSION/ConEmuPID checks into a single parent conditional block with nested checks where needed.

2. Added bash shell integration in git-prompt.sh:

   • PROMPT_COMMAND emits OSC 133;D (with exit code) and 133;A
   • DEBUG trap emits OSC 133;C before command execution
   • PS1 includes OSC 133;B after the prompt

3. Added cmd.exe PROMPT support in init.bat:

   • Conditionally sets enhanced PROMPT when WT_SESSION is defined
   • Includes OSC 133;D, 133;A, 133;B and OSC 9;9 for directory tracking
   • Falls back to standard prompt when not in Windows Terminal

All implementations are non-intrusive and only activate when running in Windows Terminal.