Initial parametric Feather case generator

.gitignore

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+# Generated CAD and preview output
+/build/
+*.stl
+*.3mf
+*.amf
+*.off
+*.png
+/cases/*/exports/
+/cases/*/previews/
+/cases/*/history/
+/cases/*/.rebuild-*/
+/cases/.*
+
+# Local Ruby dependencies and test output
+/vendor/bundle/
+/coverage/
+/tmp/
+*.log
+
+# Python/Blender caches and crash dumps
+__pycache__/
+*.pyc
+core
+core.*
+
+# Local environment and editor files
+.env
+.env.*
+.DS_Store
+*.swp
+*.swo
+*~
+/.idea/
+/.vscode/
+/.ruby-lsp/