[BUG] VS Code terminal: every Session start runs `code --list-extensions --show-versions` (a full Electron launch)

What happens

Each time a Claude Code Session starts in a VS Code integrated terminal, Claude Code runs code --list-extensions --show-versions. On macOS that code call is a full Electron launch, and each one leaves a new cli.log directory under ~/Library/Application Support/Code/logs/.

On a day with many Sessions this adds up: 95 cli.log directories on one day (2026-10-08), and 20 more by mid-morning the next day. Each launch costs noticeable CPU and startup time.

Expected

Check for the extension once and cache the result, or read ~/.vscode/extensions/extensions.json (or the TERM_PROGRAM/VSCODE_* env vars) rather than starting the code CLI on every Session start.

Environment

• Claude Code 2.1.295 (CLI in the VS Code terminal, VS Code extension 2.1.295)
• VS Code 1.140.0
• macOS (arm64)

Repro

1. Open a VS Code integrated terminal and run claude several times.
2. Watch ls ~/Library/Application\ Support/Code/logs/: a new directory with a cli.log appears for each start.