refactor(scribe): normalize ASCII formatting

Remove decorative Unicode banner comments, replace em-dashes with
hyphens across Dockerfile, configs, docs, and one Go log string,
alphabetize the builder-stage yum package list, and drop the
non-standard description/version LABELs from the runtime stage.

scribe-2.2/example/docker-compose.yml

@@ -9,7 +9,7 @@ services:
     volumes:
       # Reuse the repo's default config (read-only).
       - ../config/scribe.conf:/etc/scribe/scribe.conf:ro
-      # Host-visible log output — files land here after the sender runs.
+      # Host-visible log output: files land here after the sender runs.
       - ./logs:/var/log/scribe
     restart: unless-stopped