Edit/Write deny pattern '//bin/**' incorrectly matches project-relative bin/ directory

Bug Description

The Edit(//bin/**) and Write(//bin/**) deny patterns in .claude/settings.json are incorrectly matching project-relative bin/ directories (e.g., <project>/bin/webpack), not just the system /bin/ directory.

According to the documentation, the // prefix should represent an absolute filesystem root path, meaning //bin/** should only match /bin/** (system directory), not <project>/bin/**.

Steps to Reproduce

1. Create .claude/settings.json with the following deny rules:

{
  "permissions": {
    "deny": [
      "Edit(//bin/**)",
      "Write(//bin/**)"
    ]
  }
}

1. Attempt to edit or create a file in the project's bin/ directory (e.g., bin/webpack)
2. The operation is denied with: File is in a directory that is denied by your permission settings.

Expected Behavior

Edit(//bin/**) should only deny editing files under the system /bin/ directory, not project-relative bin/ directories.

Actual Behavior

Edit(//bin/**) denies editing any file with bin/ in its path, including project files like /Users/user/repos/project/bin/webpack.

Environment

• Claude Code (CLI)
• macOS (Darwin 25.2.0)

Workaround

Remove Edit(//bin/**) and Write(//bin/**) from the deny list entirely. System /bin/ is protected by OS-level permissions anyway.