[BUG] Auto Mode missing from VS Code extension mode selector dropdown (v2.1.143)

Description

Auto Mode has disappeared from the VS Code extension's mode selector dropdown as of v2.1.143. The dropdown (accessed via the mode chip or Shift+Tab in the input area) only shows three modes:

• Ask before edits
• Edit automatically
• Plan mode

Auto Mode is no longer listed. This was working as recently as 2025-05-16.

Environment

• Claude Code version: 2.1.143
• VS Code extension version: v2.1.143 (anthropic.claude-code)
• OS: Ubuntu 20.04 on WSL2 (kernel 6.6.87.2-microsoft-standard-WSL2)
• Installation method: VS Code extension (not npm)

Steps to Reproduce

1. Open VS Code with Claude Code extension v2.1.143
2. Open a Claude Code session
3. Click the mode selector (bottom-right of input area) or press Shift+Tab
4. Observe only 3 modes shown — Auto Mode is missing

Expected Behavior

The mode selector dropdown should include Auto Mode as a fourth option, as it did in previous versions.

Actual Behavior

Only "Ask before edits", "Edit automatically", and "Plan mode" are shown. Auto Mode is completely absent from the UI.

Screenshots

The mode selector dropdown showing only 3 modes (no Auto Mode visible).

Related Issues

• #54080 — auto mode removed from permission-mode choices in native builds
• #51879 — auto mode not available via any entry path in some configurations

Additional Context

The v2.1.143 changelog mentions "Shift+Tab in attached agent sessions now includes auto mode in the cycle," suggesting Auto Mode should still be accessible. However, neither the dropdown UI nor Shift+Tab cycling reveals Auto Mode in this environment.