[macOS][Install] v0.0.107 uninstall reports success but leaves openshell-gateway in PATH

## Description

On macOS, a full `nemoclaw uninstall --yes` on NemoClaw v0.0.107 exits successfully but leaves the OpenShell gateway executable discoverable in PATH. This is a regression of the behavior fixed in public issue #7315.

## Steps to reproduce

1. Install and onboard NemoClaw v0.0.107 with the OpenClaw runtime.
2. Run `nemoclaw uninstall --yes`.
3. Run `command -v openshell-gateway`.

## Actual result

The uninstall command exits with status 0, but the executable remains:

```text
/opt/homebrew/bin/openshell-gateway
```

## Expected result

A successful full uninstall removes NemoClaw-managed OpenShell executables, and `command -v openshell-gateway` returns no path.

## Regression

Yes. Public issue #7315 was closed after this behavior was fixed. The same symptom is reproducible again with v0.0.107. The current regression was reproduced on macOS only; other platforms were not retested for this report.

## Environment

```text
Device: Apple Silicon Mac
OS: macOS 26.5 (Darwin 25.5.0)
Architecture: arm64
Node.js: v22.23.2
npm: 10.9.8
Docker: Docker Engine 29.4.1
OpenShell CLI: 0.0.101
NemoClaw: v0.0.107
OpenClaw: 2026.7.1
```

## Impact

Users receive a successful uninstall result while a managed executable remains installed. This leaves the machine in an unexpected partial-install state and can affect later clean-install or upgrade workflows.

---
[NVB#6597485](https://nvbugspro.nvidia.com/bug/6597485)