Add all scaffolding, design, and decision documentation AKA first commit

.gitignore

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+# Rust / Tauri
+/src-tauri/target/
+**/*.rs.bk
+*.pdb
+
+# Node / Vite / Svelte
+node_modules/
+/dist/
+/.svelte-kit/
+/build/
+*.local
+
+# Models (downloaded at runtime, never committed)
+/models/
+*.bin
+*.gguf
+*.onnx
+
+# Local app data captured during dev runs
+/.wa-dev-data/
+*.wav
+*.flac
+
+# Editor / OS
+.vscode/*
+!.vscode/extensions.json
+.idea/
+.DS_Store
+Thumbs.db
+
+# Secrets / env
+.env
+.env.*
+!.env.example