feat(runtime): add M2 live play mode, assets, export and hot reload

- play/pause/stop with a tracked-transform snapshot and validation summary
- asset browser with kind filters and image preview from project assets
- BSN and imperative Rust export through bevy_forge_core codegen
- .forge.ron watcher applying transform/name/visibility edits
- 95 runtime tests; workspace 441 passed; M2 demo docs/screenshots

crates/bevy_forge_runtime/examples/editor_live.rs

@@ -12,14 +12,25 @@
 //! `FORGE_SCENE=""` disables scene loading. With no scene (or a load failure)
 //! the editor still starts with its placeholder camera and empty hierarchy.
 
+use std::path::PathBuf;
+
 use bevy::{prelude::*, window::WindowResolution};
 use bevy_forge_runtime::EditorPlugin;
 
 fn main() {
+    // Let AssetServer resolve project-relative paths (`textures/coin.png`) from the
+    // demo project's assets directory, not from the runtime crate's own assets.
+    let project =
+        std::env::var("FORGE_PROJECT").unwrap_or_else(|_| "examples/demo-project".to_string());
+    let project = std::fs::canonicalize(&project).unwrap_or_else(|_| PathBuf::from(&project));
+    if project.join("assets").is_dir() {
+        std::env::set_var("BEVY_ASSET_ROOT", &project);
+    }
+
     App::new()
         .add_plugins(DefaultPlugins.set(WindowPlugin {
             primary_window: Some(Window {
-                title: "Bevy Forge — M1 Core".into(),
+                title: "Bevy Forge — M2 Live".into(),
                 resolution: WindowResolution::new(1440, 900).with_scale_factor_override(1.0),
                 ..default()
             }),