fix(mdm): detect logged-in console user when running as root

[shubham-stepsecurity]

What does this PR do?

Type of change

• Bug fix
• Enhancement
• Documentation

Testing

• Tested on macOS (version: ___)
• Binary runs without errors: ./stepsecurity-dev-machine-guard --verbose
• JSON output is valid: ./stepsecurity-dev-machine-guard --json | python3 -m json.tool
• No secrets or credentials included
• Lint passes: make lint
• Tests pass: make test

Related Issues

[Copilot]

Pull request overview

This PR improves macOS behavior when the agent runs as root (e.g., via LaunchDaemon) by detecting the logged-in console user and using that identity/home directory for scans and configuration.

Changes:

• Add Executor.LoggedInUser() (console user detection via /dev/console on macOS when root) and use it to resolve $HOME and developer identity.
• Update enterprise Node scanning to optionally delegate package-manager commands to the logged-in user.
• Update launchd installation to bake HOME into the generated plist when running as root; also adds timestamps to progress/error log lines.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
internal/executor/executor.go	Adds LoggedInUser() implementation for macOS root console-user detection.
internal/executor/mock.go	Adds mock LoggedInUser() implementation.
internal/telemetry/telemetry.go	Uses LoggedInUser() for $HOME resolution and passes logged-in username into Node scanner.
internal/scan/scanner.go	Uses LoggedInUser() for $HOME resolution in community scans.
internal/device/device.go	Uses LoggedInUser() for developer identity fallback.
internal/detector/aicli.go	Uses LoggedInUser() for tilde expansion home directory.
internal/detector/nodescan.go	Adds user-delegated execution path for Node package manager commands.
internal/launchd/launchd.go	Injects HOME env var into LaunchDaemon plist when a user home is resolved.
internal/progress/progress.go	Prepends timestamps to progress/error log lines.

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