Docs Update

docs/reference/architecture-data-flow.md

@@ -22,3 +22,18 @@ sequenceDiagram
   Booter->>Booter: AsyncFunction start ctx from init.js
 ```
 
+After replication, the booter records **`vfs`** → **`ctx`** → **`repl`** → **`initd`** → **`kernel_invoke`** (see [`KERNEL_CONTRACT`](../architecture/KERNEL_CONTRACT.md)) before the stock **`start(ctx)`** loop opens the interactive shell unless **`BARE_OS_SKIP_REPL`** applies.
+
+```mermaid
+flowchart TB
+  vfsStep[vfs createVfs]
+  ctxStep[ctx buildBareCtxObjectFromHost]
+  replStep[repl createKernelReplSession]
+  initdStep[initd bare-initd]
+  kern[kernel_invoke runKernelFromSource]
+  shell[Interactive execLine loop]
+  vfsStep --> ctxStep --> replStep --> initdStep --> kern --> shell
+```
+
+![Booter phase ordering](../images/boot-flow.png)
+