Fix scaffold duplication and add --version flag (v0.9.1)

- build.rs: clean OUT_DIR before copying templates/assets to prevent
  stale artifacts from prior builds causing nested default/ directory
- cli: add #[command(version)] so `arcane --version` works
- mcp: fix hardcoded server version string (was 0.7.0, now 0.9.1)
- Bump all packages to 0.9.1

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: jsvd

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 All notable changes to Arcane are documented here.
 
+## [0.9.1] - 2026-02-14
+
+### Fixed
+- `arcane new` scaffold duplication: stale build artifacts caused a nested `default/` subdirectory in scaffolded projects (build.rs now cleans OUT_DIR before copying)
+- `arcane --version` flag: added `#[command(version)]` to clap derive so `arcane --version` prints the current version
+- MCP server version string: was hardcoded as `0.7.0`, now reports the correct version
+
 ## [0.9.0] - 2026-02-14
 
 ### Added

Cargo.lock

@@ -99,8 +99,8 @@ Rails for games. Rails didn't beat Java by being more powerful — it beat it by
 **v0.9.0 — Phases 21-25 complete!**
 
 All packages published and ready to use:
-- **npm**: [@arcane-engine/runtime@0.9.0](https://www.npmjs.com/package/@arcane-engine/runtime), [@arcane-engine/create@0.9.0](https://www.npmjs.com/package/@arcane-engine/create)
-- **crates.io**: [arcane-engine@0.9.0](https://crates.io/crates/arcane-engine), [arcane-cli@0.9.0](https://crates.io/crates/arcane-cli)
+- **npm**: [@arcane-engine/runtime@0.9.1](https://www.npmjs.com/package/@arcane-engine/runtime), [@arcane-engine/create@0.9.1](https://www.npmjs.com/package/@arcane-engine/create)
+- **crates.io**: [arcane-engine@0.9.1](https://crates.io/crates/arcane-engine), [arcane-cli@0.9.1](https://crates.io/crates/arcane-cli)
 
 **Current features:**
 - ✅ Core engine: rendering, audio, text, UI, animation, pathfinding, tweening, particles

README.md

@@ -1,6 +1,6 @@
 [package]
 name = "arcane-cli"
-version = "0.9.0"
+version = "0.9.1"
 edition.workspace = true
 license.workspace = true
 description = "CLI for Arcane - agent-native 2D game engine (dev server, testing, project scaffolding)"
@@ -17,7 +17,7 @@ name = "arcane"
 path = "src/main.rs"
 
 [dependencies]
-arcane-engine = { version = "0.9.0", path = "../core", features = ["renderer"] }
+arcane-engine = { version = "0.9.1", path = "../core", features = ["renderer"] }
 clap = { version = "4", features = ["derive"] }
 tokio = { version = "1", features = ["full"] }
 anyhow = "1"

cli/Cargo.toml

@@ -38,14 +38,25 @@ fn find_dir(name: &str) -> PathBuf {
     );
 }
 
+fn clean_dir(dir: &Path) {
+    if dir.exists() {
+        fs::remove_dir_all(dir).unwrap();
+    }
+}
+
 fn main() {
     let out_dir = PathBuf::from(std::env::var("OUT_DIR").unwrap());
 
+    // Clean before copying to prevent stale artifacts from prior builds
+    let templates_dst = out_dir.join("templates");
+    clean_dir(&templates_dst);
     let templates_src = find_dir("templates/default");
-    copy_dir_recursive(&templates_src, &out_dir.join("templates").join("default"));
+    copy_dir_recursive(&templates_src, &templates_dst.join("default"));
 
+    let assets_dst = out_dir.join("assets");
+    clean_dir(&assets_dst);
     let assets_src = find_dir("assets");
-    copy_dir_recursive(&assets_src, &out_dir.join("assets"));
+    copy_dir_recursive(&assets_src, &assets_dst);
 
     println!("cargo:rerun-if-changed=../templates/default");
     println!("cargo:rerun-if-changed=../assets");

cli/build.rs

@@ -3,7 +3,7 @@ mod commands;
 use clap::{Parser, Subcommand};
 
 #[derive(Parser)]
-#[command(name = "arcane", about = "Arcane 2D game engine CLI")]
+#[command(name = "arcane", version, about = "Arcane 2D game engine CLI")]
 struct Cli {
     #[command(subcommand)]
     command: Commands,

cli/src/main.rs

@@ -1,6 +1,6 @@
 [package]
 name = "arcane-engine"
-version = "0.9.0"
+version = "0.9.1"
 edition.workspace = true
 license.workspace = true
 description = "Core library for Arcane - agent-native 2D game engine (TypeScript runtime, renderer, platform layer)"

core/Cargo.toml

@@ -129,7 +129,7 @@ fn handle_jsonrpc(body: &str, request_tx: &RequestSender) -> String {
     match rpc_method.as_str() {
         "initialize" => {
             format!(
-                r#"{{"jsonrpc":"2.0","result":{{"protocolVersion":"2025-03-26","capabilities":{{"tools":{{}}}},"serverInfo":{{"name":"arcane-mcp","version":"0.7.0"}}}},"id":{rpc_id}}}"#,
+                r#"{{"jsonrpc":"2.0","result":{{"protocolVersion":"2025-03-26","capabilities":{{"tools":{{}}}},"serverInfo":{{"name":"arcane-mcp","version":"0.9.1"}}}},"id":{rpc_id}}}"#,
             )
         }
         "notifications/initialized" => {

core/src/agent/mcp.rs

@@ -1,6 +1,6 @@
 {
   "name": "@arcane-engine/create",
-  "version": "0.9.0",
+  "version": "0.9.1",
   "description": "Create a new Arcane game project",
   "type": "module",
   "bin": {

packages/create/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@arcane-engine/runtime",
-  "version": "0.9.0",
+  "version": "0.9.1",
   "description": "Agent-native 2D game engine runtime - TypeScript APIs for state management, rendering, and game logic",
   "type": "module",
   "scripts": {