[Bug] Reinstaller fails to update shell aliases from previous installation

Bug Description
Hi folks, reporting bug:

Title: Reinstall breaks CLI - old alias in .zshrc points to removed path

Description:

After the Claude CLI auto-updated (or broke), I ran the official reinstaller:

curl -fsSL https://claude.ai/install.sh | sh

The install succeeded and reported:
Location: ~/.local/bin/claude

However, the CLI wouldn't run - zsh kept trying to execute the old path:
zsh: no such file or directory: /Users/lukeskywalker/.claude/local/claude

Root cause: The original installation added an alias to ~/.zshrc:
alias claude=~/.claude/local/claude

The reinstaller put the binary in a new location (~/.local/bin/claude) but did not update or
remove the old alias in .zshrc.

Fix required: Manually edit ~/.zshrc to update the alias path.

Expected behavior: The installer should either:

1. Remove/update any existing claude aliases in shell config files
2. Or install to the same location as the previous install

Environment:

• macOS (Darwin 25.2.0)
• zsh
• Claude Code 2.0.76

Environment Info

• Platform: darwin
• Terminal: vscode
• Version: 2.0.76
• Feedback ID: 40da3c35-9c71-4406-a017-1258ccc0d506

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/lukeskywalker/.local/share/claude/versions/2.0.76 (expected in multi-process scenarios)\n    at XZR (/$bunfs/root/claude:2430:2165)\n    at fUA (/$bunfs/root/claude:2430:1885)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-12-31T01:02:23.456Z"}]

Thanks,
Matt