experiment: mirror governance.yml shape (add workflow_dispatch + concurrency)

Author: hyperpolymath

.github/workflows/rust-ci-v2.yml

@@ -1,13 +1,18 @@
 # SPDX-License-Identifier: MPL-2.0
 # Rust CI — thin wrapper calling the shared estate reusable in
 # hyperpolymath/standards. Configure once, propagate everywhere.
-# See: docs/CI-REUSABLE-WORKFLOWS.adoc in standards.
+
 name: Rust CI
 
 on:
   push:
     branches: [main, master]
   pull_request:
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 permissions:
   contents: read