[BUG] Auto-update never worked

Environment

• Platform (select one):
• [x] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 0.2.102 (Claude Code)
• Operating System: macOS 15.4.1
• Terminal: iTerm2

Bug Description

I see Auto-updating to v0.2.103… message upon entering the CLI, then ✓ Update installed · Restart to apply.
However, after exiting the CLI (with ctrl+c or /exit) and re-entering the CLI, it's still on v0.2.102 and it's attempting to auto-update to v0.2.103 again.
Running npm install -g @anthropic-ai/claude-code actually updates it.

Steps to Reproduce

1. <!-- First step -->
2. <!-- Second step -->
3. <!-- And so on... -->

Expected Behavior

<!-- What you expected to happen -->

Actual Behavior

<!-- What actually happened -->

Additional Context

I use volta for npm package management so the executable is located at /Users/<username>/.volta/bin/claude