docs: clarify SolidCraft clone and compatible build names

CONTRIBUTING.md

@@ -16,12 +16,19 @@ You need stable Rust 1.95 or newer (required by egui/eframe 0.36). For the web
 build you also need `rustup target add wasm32-unknown-unknown` and [`trunk`](https://trunkrs.dev).
 
 ```sh
-git clone https://github.com/bherbruck/solidcraft && cd solvecraft
+git clone https://github.com/bherbruck/solidcraft && cd solidcraft
 cargo run --release -p solvecraft -- --sample      # desktop app with a sample part
 cargo xtask test                                   # unit, engine and UI-scenario tests
 cargo xtask ci                                     # everything a PR must pass (see below)
 ```
 
+SolidCraft is the product and repository name. Cargo packages and executables retain
+their `solvecraft` names for compatibility with existing scripts and MCP clients.
+Build the desktop app with `cargo build --release -p solvecraft`, or the CLI with
+`cargo build --release -p solvecraft-cli`. Run the CLI with
+`cargo run --release -p solvecraft-cli -- commands` (or `target/release/solvecraft-cli commands`
+after building). There is no Cargo package named `solidcraft`.
+
 Web: `cd apps/solvecraft-web && trunk serve --release`, then open the printed URL (`?sample`
 opens the sample part, `?webgl` forces WebGL2). Saving and opening files in the browser needs
 HTTPS or localhost, because it uses the Origin Private File System.