feat: add --suggest flag plumbing

Adds the SUGGEST flag variable, CLI argument parsing, and help text
for the upcoming --suggest feature. The flag is wired but behavior
will be implemented in subsequent tasks.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/dot-backup.sh b/dot-backup.sh
index 701153f..128a733 100755
--- a/dot-backup.sh
+++ b/dot-backup.sh
@@ -52,6 +52,7 @@ VERBOSE=false
 RESTORE=false
 QUIET=false
 PUSH=false
+SUGGEST=false
 
 usage() {
     echo "Usage: $0 [options]"
@@ -60,6 +61,7 @@ usage() {
     echo "  -r, --restore    Restore dotfiles from backup to their original locations"
     echo "  -q, --quiet      Suppress stdout; write output to log instead"
     echo "  -p, --push       Push to remote after commit (requires GIT_REMOTE in config)"
+    echo "  -s, --suggest    List untracked config dirs/files new since last backup, then exit"
     echo "  -h, --help       Show this help"
     exit 0
 }
@@ -71,6 +73,7 @@ for arg in "$@"; do
         -r|--restore) RESTORE=true ;;
         -q|--quiet) QUIET=true ;;
         -p|--push) PUSH=true ;;
+        -s|--suggest) SUGGEST=true ;;
         -h|--help) usage ;;
         *) echo -e "${RED}Unknown option: $arg${NC}"; usage ;;
     esac