refactor get_host_ip method to use route for host IP detection

[pollardld]

Updates the Vagrantfile to use a more robust get_host_ip method. Increases the likely hood of only one IP address being returned, bc more than one causes a vagrant error that looks like:

Failed to mount folders in Linux guest. This is usually because the "vboxsf" file system is not available. Please verify that the guest additions are properly installed in the guest and can work properly. 

The command attempted was: mount -t cifs -o sec=ntlmssp,nounix,noperm,credentials=/etc/smb_creds_vgt-4a82863d8d3fe61c5cc456cafda2a689-ac1b791f827cf72cc7e905345947e259,uid=1000,gid=1000,mfsymlinks,_netdev,vers=3.0 //169.254.13.159 192.168.86.131/vgt-4a82863d8d3fe61c5cc456cafda2a689-ac1b791f827cf72cc7e905345947e259 /usr/local/apps/madrona_portal 

The error output from the last command was: 

mount: //169.254.13.159: can't find in /etc/fstab. bash: line 6: 192.168.86.131/vgt-4a82863d8d3fe61c5cc456cafda2a689-ac1b791f827cf72cc7e905345947e259: No such file or directory

[Copilot]

Pull request overview

Refactors the host IP autodetection used by the Vagrantfile (macOS/QEMU path) to reduce cases where multiple host IPs are detected and SMB synced-folder mounting fails.

Changes:

• Replace ifconfig | grep ... host IP detection with a route-based approach to pick the default-route interface.
• Update inline comments describing the new detection pipeline.

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[Copilot]

This command can still produce multiple IPv4 addresses for the chosen interface (e.g., if the interface has aliases), and .strip won’t collapse internal newlines—so host_ip may contain multiple lines and still trigger the SMB mount error this change is trying to avoid. Consider using a command that guarantees a single address (e.g., ipconfig getifaddr <iface> on macOS) or explicitly selecting/filtering one address (first line and excluding 169.254/loopback), and handle the empty-output case with a clear failure message.

Suggested change

	# This uses `route` to find the host's default IP address
	# and pipes it through to `awk` and `ifconfig`
	# to extract the IP address of the host machine.
	host_ip = `route -n get default | awk '/interface:/{print $2}' | xargs ifconfig | awk '/inet / {print $2}'`.strip
	# This uses `route` to find the host's default network interface
	# and then `ipconfig getifaddr` to get a single IPv4 address
	# for that interface on macOS.
	interface = `route -n get default | awk '/interface:/{print $2}'`.strip
	host_ip = ""
	unless interface.empty?
	host_ip = `ipconfig getifaddr #{interface}`.strip
	end
	if host_ip.nil? || host_ip.empty?
	raise "Unable to determine host IP address for SMB mount. Please configure smb_host_ip manually in the Vagrantfile."
	end

[Copilot]

There’s trailing whitespace at the end of these comment lines; please remove it to avoid churn in diffs and whitespace-only changes.