ci: add concurrency to checksum.yml; add smoke-test to win-install.yml

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ss-o

.github/workflows/checksum.yml

@@ -13,6 +13,10 @@ on:
 permissions:
   contents: write
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: false
+
 jobs:
   checksum:
     if: github.repository == 'z-shell/zi-src'

.github/workflows/win-install.yml

@@ -60,3 +60,13 @@ jobs:
           command rm -rf "${XDG_DATA_HOME:-$HOME/.local/share}/zi" /home/runneradmin/.zi
           sh -x ./lib/sh/install.sh -- -a zpmod
         shell: C:\tools\cygwin\bin\bash.exe --login -o igncr '{0}'
+      - name: 🪟 Smoke-test — verify zi.zsh present
+        run: |
+          ZI_BIN="${XDG_DATA_HOME:-${HOME}/.local/share}/zi/bin"
+          if [ ! -f "${ZI_BIN}/zi.zsh" ]; then
+            printf '%s\n' "FAIL: zi.zsh not found at ${ZI_BIN}/zi.zsh"
+            exit 1
+          fi
+          printf '%s\n' "OK: zi.zsh found at ${ZI_BIN}/zi.zsh"
+          command rm -rf "${XDG_DATA_HOME:-${HOME}/.local/share}/zi" /home/runneradmin/.zi
+        shell: C:\tools\cygwin\bin\bash.exe --login -o igncr '{0}'