build(pkgbuild): prefix advisory warnings with hint:

makepkg has no `hint` helper, so the warnings about missing `gh` /
missing authentication read as if the script intends to perform the
action itself. Prefix them with `hint:` to make their advisory nature
explicit.

Author: claude

template/parallel-disk-usage-bin/PKGBUILD

@@ -19,13 +19,13 @@ sha1sums=(
 prepare() {
   if ! command -v gh > /dev/null 2>&1; then
     warning 'GitHub CLI (gh) not found, skipping provenance verification.'
-    warning 'Install the github-cli package to enable cryptographic verification of release artifacts.'
+    warning 'hint: install the github-cli package to enable cryptographic verification of release artifacts.'
     return 0
   fi
 
   if ! gh auth status > /dev/null 2>&1; then
     warning 'gh is not authenticated, skipping provenance verification.'
-    warning 'Run `gh auth login` (or set GH_TOKEN) to enable cryptographic verification of release artifacts.'
+    warning 'hint: run `gh auth login` (or set GH_TOKEN) to enable cryptographic verification of release artifacts.'
     return 0
   fi