feat(ci): use-git-clone/submodules default-on in action (main)

Runner fetches the composite action from @main. Propagates the
default-on transport/submodules inputs and explicit flag forwarding.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitea/actions/local-ci-build/action.yml

@@ -48,9 +48,10 @@ inputs:
 
   submodules:
     description: >
-      Set to "true" to clone the repository with --recurse-submodules.
+      Recurse submodules when cloning. Default "true". Set to "false"
+      to skip submodule init/update.
     required: false
-    default: 'false'
+    default: 'true'
 
   guest-os:
     description: >
@@ -61,12 +62,14 @@ inputs:
 
   use-git-clone:
     description: >
-      Set to "true" to clone the repository inside the VM rather than
-      transferring a zip from the host. Requires Git in the template (see
-      Install-CIToolchain-WinBuild2025.ps1 Step 12 / Install-CIToolchain-Linux2404.sh).
-      Preferred for repositories larger than ~200 MB.
+      Transport for the repo source. Default "true": clone inside the
+      build VM (requires Git in the template — see
+      Install-CIToolchain-WinBuild2025.ps1 Step 12 /
+      Install-CIToolchain-Linux2404.sh). Set to "false" for the
+      host-side variant: the host clones the repo and transfers a zip
+      to the guest (useful when the guest cannot reach Gitea).
     required: false
-    default: 'false'
+    default: 'true'
 
   configuration:
     description: >
@@ -269,8 +272,13 @@ runs:
             '--snapshot-name',         $resolvedSnapshotName
         )
 
-        if ($env:INPUT_SUBMODULES       -eq 'true') { $pyArgs += '--submodules' }
-        if ($env:INPUT_USE_GIT_CLONE    -eq 'true') { $pyArgs += '--use-git-clone' }
+        # Submodules and transport default to ON; pass the explicit
+        # negative flag when the caller opted out so the Python default
+        # (also ON) is overridden deterministically.
+        if ($env:INPUT_SUBMODULES -eq 'false') { $pyArgs += '--no-submodules' }
+        else { $pyArgs += '--submodules' }
+        if ($env:INPUT_USE_GIT_CLONE -eq 'false') { $pyArgs += '--host-clone' }
+        else { $pyArgs += '--use-git-clone' }
         if ($env:INPUT_USE_SHARED_CACHE -eq 'true') { $pyArgs += '--use-shared-cache' }
         if ($env:INPUT_SKIP_ARTIFACT    -eq 'true') { $pyArgs += '--skip-artifact' }
         if ($env:INPUT_EXTRA_GUEST_ENV_JSON -and $env:INPUT_EXTRA_GUEST_ENV_JSON -ne '{}') {