chore: initial scaffold

Empty repo bootstrap so cloud planning tools can ingest it.
Architecture and implementation plan tracked separately.

.gitignore

@@ -0,0 +1,33 @@
+# Rust
+/target
+**/target
+Cargo.lock.bak
+*.pdb
+
+# Node / Tauri frontend
+node_modules
+dist
+dist-ssr
+.vite
+*.local
+
+# Tauri
+/app/src-tauri/target
+/app/src-tauri/binaries/mycelium*
+/app/src-tauri/gen/schemas
+
+# Editor / OS
+.DS_Store
+.idea
+.vscode/*
+!.vscode/extensions.json
+*.swp
+*.swo
+Thumbs.db
+
+# Secrets / runtime
+*.bin
+priv_key.bin
+*.log
+.env
+.env.local