Rename docker-compose.yml to compose.yml

- Use modern Compose file naming convention
- Remove deprecated version specification
- Update command example to use 'docker compose'

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

compose.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   security-lint:
     build:
@@ -10,4 +8,4 @@ services:
       # Mount the target directory as read-only
       - ${TARGET_PATH:-.}:/target:ro
     # Default command can be overridden
-    # Example: docker-compose run --rm security-lint /target/app -s high
+    # Example: docker compose run --rm security-lint /target/app -s high