Add update_deps.ps1 (clone computer enhance repo)

scripts/helpers/misc.ps1

@@ -1,6 +1,15 @@
-function clone-gitrepo { param( [string] $path, [string] $url )
+function clone-gitrepo { param( [string] $path, [string] $url, [switch] $NoPull )
 	if (test-path $path) {
-		# git -C $path pull
+		if ($NoPull) {
+			Write-Host "Skipping pull on $path (per -NoPull)."
+			return
+		}
+		# Already a checkout — refresh to upstream tip.
+		# --ff-only refuses to create a merge commit if the local branch has
+		# diverged, so a divergence surfaces as a clear git error instead of a
+		# silent merge. Preserves the read-only intent of update_deps.
+		Write-Host "Pulling latest into $path ..."
+		git -C $path pull --ff-only
 	}
 	else {
 		Write-Host "Cloning $url ..."

scripts/update_deps.ps1

@@ -0,0 +1,25 @@
+# ════════════════════════════════════════════════════════════════════════════
+# update_deps.ps1 — fetch / refresh.
+# ════════════════════════════════════════════════════════════════════════════
+param(
+    [switch] $NoPull # Skip the `git pull` step when the checkout already exists.
+)
+
+$path_root           = split-path -Path $PSScriptRoot -Parent
+$path_course_content = join-path $path_root 'course_content'
+$misc                = join-path $PSScriptRoot 'helpers/misc.ps1'; . $misc
+
+# Halt on any error (instead of PowerShell's default `Continue`).
+$ErrorActionPreference = 'Stop'
+
+
+# --- Dependency Definition ---
+# One external dep for now: Casey Muratori's computer_enhance course repo.
+$url_computer_enhance = 'https://github.com/cmuratori/computer_enhance.git'
+
+# --- Run ---
+if ($NoPull) { clone-gitrepo $path_course_content $url_computer_enhance -NoPull }
+else         { clone-gitrepo $path_course_content $url_computer_enhance }
+
+write-host ''
+write-host 'Course content up to date.'