/doctor falsely flags native installer as 'Leftover npm global installation'

Bug

/doctor reports a false positive about a leftover npm installation when Claude Code was installed via the official native installer (not npm).

Reproduction

1. Install Claude Code using the official native installer (currently active install path).
2. Run /doctor.

Expected

No warning — this is the canonical install layout.

Actual

- Leftover npm global installation at /Users/<user>/.local/bin/claude
  Suggested fix: Run: npm -g uninstall @anthropic-ai/claude-code

The suggested fix has no effect because there is no npm package present:

$ npm -g uninstall @anthropic-ai/claude-code
up to date in 651ms

Diagnostic data

• Claude Code: v2.1.126
• Symlink target: ~/.local/bin/claude → ~/.local/share/claude/versions/2.1.126
• Versions present in cache: 2.1.121, 2.1.122, 2.1.123, 2.1.126 (rolling native-installer cache)
• OS: macOS Darwin 22.6.0 x86_64
• which -a claude: returns only the native installer path (no duplicates)
• npm list -g --depth=0 | grep claude: empty

Root cause hypothesis

The detection in /doctor likely flags any claude binary under ~/.local/bin/ as npm-installed without verifying that the symlink target points to ~/.local/share/claude/versions/, which is the canonical native-installer layout.

Suggested fix

When checking for npm leftovers, exclude binaries whose resolved symlink target is under ~/.local/share/claude/versions/. Alternatively, additionally verify with npm list -g whether the package is actually present before reporting.