fix: Replace UTF-8 em-dash with ASCII hyphen in CLI output and tests

Replace em-dash (—) with ASCII hyphen (-) in:
- bin/disinto: 'Dry run complete' message
- bin/disinto: import skip message
- lib/init/nomad/cluster-up.sh: 'Dry run complete' message
- tests/disinto-init-nomad.bats: test assertions

This fixes CI failures caused by bats test runner not handling UTF-8
em-dash characters correctly.

tests/disinto-init-nomad.bats

@@ -44,7 +44,7 @@ setup_file() {
   [[ "$output" == *"[dry-run] Step 8/9: systemctl start nomad + poll until ≥1 node ready"* ]]
   [[ "$output" == *"[dry-run] Step 9/9: write /etc/profile.d/disinto-nomad.sh"* ]]
 
-  [[ "$output" == *"Dry run complete — no changes made."* ]]
+  [[ "$output" == *"Dry run complete - no changes made."* ]]
 }
 
 # ── --backend=nomad --empty --dry-run ────────────────────────────────────────
@@ -58,7 +58,7 @@ setup_file() {
   # both modes invoke the same cluster-up dry-run.
   [[ "$output" == *"nomad backend: --empty (cluster-up only, no jobs)"* ]]
   [[ "$output" == *"[dry-run] Step 1/9: install nomad + vault binaries + docker daemon"* ]]
-  [[ "$output" == *"Dry run complete — no changes made."* ]]
+  [[ "$output" == *"Dry run complete - no changes made."* ]]
 }
 
 # ── --backend=docker (regression guard) ──────────────────────────────────────
@@ -238,7 +238,7 @@ setup_file() {
 @test "disinto init --backend=nomad without import flags shows skip message" {
   run "$DISINTO_BIN" init placeholder/repo --backend=nomad --dry-run
   [ "$status" -eq 0 ]
-  [[ "$output" == *"no --import-env/--import-sops — skipping"* ]]
+  [[ "$output" == *"no --import-env/--import-sops - skipping"* ]]
 }
 
 @test "disinto init --backend=nomad --import-env --import-sops --age-key --with forgejo --dry-run shows all plans" {