Integrate zmk-javelin-steno module

- west.yml: add zmk-javelin-steno module + javelin-steno source
- corne.conf: enable steno engine with Plover + Lapwing dicts
- corne.keymap: replace steno layer with &javsteno behavior bindings

config/west.yml

@@ -11,6 +11,12 @@ manifest:
     # fork of zmk-nice-oled with custom KM medal animation
     - name: KeebMaker
       url-base: https://github.com/KeebMaker
+    # javelin steno engine module
+    - name: afiqzudinhadi
+      url-base: https://github.com/afiqzudinhadi
+    # javelin steno engine source
+    - name: jthlim
+      url-base: https://github.com/jthlim
   projects:
     # Pinned to v0.3.0 instead of `main`: ZMK main tracks Zephyr 4.1, whose
     # board-model rewrite renamed `nice_nano_v2` (now `nice_nano//zmk`) and
@@ -36,5 +42,14 @@ manifest:
     - name: zmk-oled-adapter
       remote: mctechnology17
       revision: main
+    # javelin steno engine module
+    - name: zmk-javelin-steno
+      remote: afiqzudinhadi
+      revision: main
+    # javelin steno engine source (fetched into module's javelin/ dir)
+    - name: javelin-steno
+      remote: jthlim
+      revision: main
+      path: zmk-javelin-steno/javelin
   self:
     path: config