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

README.md

@@ -52,6 +52,19 @@ cargo run -p bevy_forge_runtime --example editor_live
 
 See [docs/m1-core.md](docs/m1-core.md) for the garden demo, hotkeys and M1 limits.
 
+### M2 Live — play mode, assets, export, hot reload
+
+M2 adds Play/Pause/Stop with transform snapshot/restore, a project asset browser, BSN/Rust export
+and a `.forge.ron` transform watcher.
+
+```bash
+FORGE_PROJECT=examples/demo-project \
+FORGE_SCENE=scenes/garden.forge.ron \
+cargo run -p bevy_forge_runtime --example editor_live
+```
+
+See [docs/m2-live.md](docs/m2-live.md) for controls and M2 limits.
+
 ## Two viewports
 
 | 2D scene editing | 3D wireframe preview |