[BUG] IDE lock files always written to ~/.claude/ide, ignoring CLAUDE_CONFIG_DIR

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When CLAUDE_CONFIG_DIR is set (e.g., ~/.config/claude), the Claude Code CLI correctly uses that directory for its configuration. However, IDE integration lock files are always written to the hardcoded ~/.claude/ide/ path, regardless of the CLAUDE_CONFIG_DIR setting.

This means ~/.claude/ is always created even when the user has explicitly configured a different config directory, which defeats the purpose of CLAUDE_CONFIG_DIR.

Both sides of the IDE integration have this issue:

• The IDE plugin (IntelliJ / VS Code) writes lock files to ~/.claude/ide/
• The CLI reads lock files from ~/.claude/ide/ (via the hardcoded path in the nJR() function)

Related Issue

This was previously reported in #4739 but was closed as NOT_PLANNED and subsequently locked.

What Should Happen?

The IDE lock file directory should respect CLAUDE_CONFIG_DIR:

• If CLAUDE_CONFIG_DIR is set, lock files should be read/written at $CLAUDE_CONFIG_DIR/ide/
• If not set, fall back to the default ~/.claude/ide/

Both the CLI and IDE plugins need to agree on the resolved path.

Reproduction Steps

1. Set CLAUDE_CONFIG_DIR to a custom directory (e.g., export CLAUDE_CONFIG_DIR="$HOME/.config/claude")
2. Open an IDE (IntelliJ IDEA / VS Code) with the Claude Code plugin active
3. Observe that ~/.claude/ide/ is created with a lock file, despite CLAUDE_CONFIG_DIR pointing elsewhere

Lock File Example

{
  "workspaceFolders": ["/Users/example/project"],
  "pid": 20751,
  "ideName": "IntelliJ IDEA",
  "transport": "ws",
  "runningInWindows": false,
  "authToken": "..."
}

Environment Details

• OS: macOS (Darwin 25.3.0)
• Claude Code Version: 2.1.76
• Shell: zsh
• IDE: IntelliJ IDEA with Claude Code plugin
• Config: CLAUDE_CONFIG_DIR set to ~/.config/claude