[BUG] Claude CLI prepends its own Node & Yarn paths before Volta shims, overriding versions pinned in package.json

Environment

• Platform (select one):
• [X] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 1.0.35 (Claude Code)
• Operating System: macOS 15.5
• Terminal: iTerm2
• Volta version: 1.1.1
• Default Node version used in Volta: 20.17.0

Bug Description

When using Volta (or any other tool that relies on shims via $PATH) to manage JavaScript environments, Claude Code prepends fixed node and yarn paths to the $PATH, which leads to execution of versions not defined in package.json or .volta configuration.

Steps to Reproduce

1. Install and configure Volta
2. Create a new NPM project: mkdir test-project && cd test-project && npm init -y
3. Pin specific node version: volta pin node@20.18.2
4. Launch Claude and run /init inside the project
5. Ask Claude to execute the following commands in sequence: node --version, echo $PATH

Expected Behavior

Bash(node --version)
⎿  v20.18.2

Bash(echo $PATH)
⎿ /some/user/path/.volta/bin:...

Actual Behavior

Bash(node --version)
⎿  v20.17.0

Bash(echo $PATH)
⎿ /some/user/path/.volta/tools/image/yarn/4.9.2/bin:/some/user/path/.volta/tools/image/node/20.17.0/bin:/some/user/path/.volta/bin...

Additional Context

None