Cleaned dead code and updated documents

backends/mizan-django/README.md

@@ -144,40 +144,33 @@ Frontend gets `useChatChannel({ room })`.
 
 ## Generate the frontend
 
-The codegen is `mizan-generate` (in `protocol/mizan-generate/`). From your
-frontend project, point a config at the Django backend and run the CLI:
+The codegen is the `mizan-generate` Rust binary (source at
+`protocol/mizan-codegen/`; `protocol/mizan-generate/` is a thin npm
+launcher that dispatches to the platform binary). From your frontend
+project, point a `mizan.toml` at the Django backend and run the CLI:
 
-```js
-// frontend/django.config.mjs
-import path from "path"
-import { fileURLToPath } from "url"
+```toml
+# frontend/mizan.toml
+output = "src/api"
+targets = ["react"]
 
-const __dirname = path.dirname(fileURLToPath(import.meta.url))
-const root = path.resolve(__dirname, "..")
+[source.django]
+manage_path = "../backend/manage.py"
+command = ["uv", "run", "python"]    # optional — defaults to ["python"]
 
-export default {
-    source: {
-        django: {
-            managePath: path.join(root, "backend/manage.py"),
-            command: ["uv", "run", "python"],
-            env: {
-                PYTHONPATH: path.join(root, "backend"),
-                DJANGO_SETTINGS_MODULE: "myproject.settings",
-            },
-        },
-    },
-    output: "src/api",
-}
+[source.django.env]
+PYTHONPATH = "../backend"
+DJANGO_SETTINGS_MODULE = "myproject.settings"
 ```
 
 ```bash
-npx mizan-generate --config django.config.mjs
+mizan-generate --config mizan.toml
 ```
 
-The codegen drives Django's management command (`export_mizan_schema`) under
-the hood, then emits Stage 1 (typed `callXxx`/`fetchXxx` over the runtime
-kernel) + Stage 2 (`<MizanContext>` provider, per-context providers,
-`use{Hook}()` hooks) into `src/api/`.
+The codegen drives Django's management command (`export_mizan_ir`) under
+the hood, parses the emitted KDL IR, then emits Stage 1 (typed
+`callXxx`/`fetchXxx` over the runtime kernel) + Stage 2 (`<MizanContext>`
+provider, per-context providers, `use{Hook}()` hooks) into `src/api/`.
 
 ```tsx
 // app.tsx