add justfile as primary task runner, slim Makefile to CI-only. add styled argparse help formatter, parallel test execution (-j8 default), argparse for test-apps.py. release.py accepts --dryrun alias

justfile

@@ -0,0 +1,38 @@
+import 'utility.just'
+
+[private]
+default:
+    @echo '{{YELLOW}}Tip:{{NORMAL}} Recipes with {{BOLD}}*args{{NORMAL}} accept {{BOLD}}-h{{NORMAL}} for help.'
+    @just --list
+
+# Interactive CLI to add a new app
+[group('CLI Tools')]
+add-app:
+    @python scripts/add-app.py
+
+# Test, validate, normalize, and generate all output files
+[group('Release')]
+build: test validate normalize generate
+
+# Tag, push, and create a GitHub release
+[group('Release')]
+release *args:
+    @python scripts/release.py {{ args }}
+
+# Validate applications.json for errors (structure, regex syntax, source types)
+[group('Formatting')]
+validate:
+    @python scripts/validate-json.py src/applications.json
+
+# Normalize key order and add missing defaults in applications.json
+[group('Formatting')]
+normalize:
+    @python scripts/normalize-json.py src/applications.json
+
+# Live-test app configs
+test *args:
+    @python scripts/test-apps.py {{ args }}
+
+# Generate output files
+generate *args:
+    @{{ if args == "help" { "just _generate-help" } else if args == "-h" { "just _generate-help" } else if args == "--help" { "just _generate-help" } else if args == "table" { "just _generate-table" } else if args == "readme" { "just _generate-readme" } else if args == "standard" { "just _generate-standard" } else if args == "dual-screen" { "just _generate-dual-screen" } else { "just _generate-all" } }}