fix: resolve .env file parsing issues in Makefile

- Replace shell sourcing with grep/cut parsing to avoid JSON array interpretation
- Strip http:// prefix from registry URLs for Docker commands
- Fix docker-tag to use correct image name (unitforge-unitforge-prod)
- All make commands now work without shell parsing errors

.rules

@@ -4,6 +4,7 @@ PRODUCTION: false
 COMPATIBILITY: none
 PRINCIPLE: keep_small_simple
 
+RULE: default_shell_fish
 RULE: fix_lint_errors
 RULE: keep_code_lean
 RULE: keep_tests_consistent