Add core-v2 skill and make installable

packages/core-v2/README.md

@@ -7,6 +7,29 @@ render through `RouterView`.
 The complete function, component, option, type, gesture-edge, and choreography
 reference is in [API.md](./API.md).
 
+## Install from Git
+
+The repository root exposes this workspace package, runs its build during npm's
+Git-dependency preparation, and includes the generated JavaScript, declarations,
+and stylesheet:
+
+```bash
+npm install git+https://git.harvmaster.com/Harvmaster/Native-Router-Vue.git
+```
+
+Pin applications to a commit or tag when reproducibility matters:
+
+```bash
+npm install "git+https://git.harvmaster.com/Harvmaster/Native-Router-Vue.git#<commit-or-tag>"
+```
+
+Vue 3.5 or newer is the only peer dependency.
+
+The Git-installed repository package includes a Codex integration skill at
+`skills/build-with-native-vue-router-v2`. Copy that folder into
+`${CODEX_HOME:-$HOME/.codex}/skills` and invoke it as
+`$build-with-native-vue-router-v2`.
+
 The primitive is:
 
 > A mounted component can originate a routine that creates another component,