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.

lib/init/nomad/cluster-up.sh

@@ -135,7 +135,7 @@ EOF
   → export VAULT_ADDR=${VAULT_ADDR_DEFAULT}
   → export NOMAD_ADDR=${NOMAD_ADDR_DEFAULT}
 
-Dry run complete — no changes made.
+Dry run complete - no changes made.
 EOF
   exit 0
 fi