feat(job): wire use-git-clone + submodules; default in-guest clone

The job command previously discarded --use-git-clone and --submodules
(`del`) and always in-guest cloned with submodules off — making both
action inputs dead no-ops (submodule repos silently broken).

- job.py: --use-git-clone/--host-clone and --submodules/--no-submodules
  are real booleans defaulting to ON. Default = in-guest clone with
  submodules. --host-clone clones on the host into a temp dir
  (_host_clone) and transfers a zip; temp dir cleaned in finally.
  clone_submodules now honoured (was hardcoded False).
- action.yml: use-git-clone / submodules default 'true'; forward the
  explicit positive/negative flag so the Python default is overridden
  deterministically.
- self-test.yml: add smoke-{windows,linux}-hostclone jobs covering the
  host-side transport (default jobs already cover in-guest).
- tests: default-transport, host-clone, and --no-submodules coverage.

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

.gitea/workflows/self-test.yml

@@ -4,7 +4,9 @@
 # VM clone -> start -> IP detect -> trivial build -> artifact collect -> destroy
 #
 # Trigger: workflow_dispatch only (never runs on push/tag).
-# Both jobs are independent — a failure in one does not cancel the other.
+# Jobs are independent — a failure in one does not cancel the others.
+# Covers both source transports: in-guest git clone (default) and the
+# host-side clone + zip transfer variant (use-git-clone: 'false').
 #
 # Prerequisites (must be in place before running):
 #   - Runner labels: windows-build:host and linux-build:host active
@@ -43,4 +45,29 @@ jobs:
           artifact-source: '/opt/ci/output'
           guest-os:        'Linux'
           job-id-suffix:   'smoke-linux'
-          artifact-name:   'smoke-linux-${{ github.run_id }}'
+          artifact-name:   'smoke-linux-${{ github.run_id }}'
+
+  # ── Host-side clone + zip transfer variant (use-git-clone: 'false') ───────
+  smoke-windows-hostclone:
+    runs-on: windows-build
+    steps:
+      - uses: https://gitea.emulab.it/Simone/local-ci-cd-system/.gitea/actions/local-ci-build@main
+        with:
+          build-command:   'New-Item -ItemType Directory -Path C:\CI\output -Force | Out-Null; Set-Content C:\CI\output\smoke.txt "smoke-ok"'
+          artifact-source: 'C:\CI\output'
+          guest-os:        'Windows'
+          use-git-clone:   'false'
+          job-id-suffix:   'smoke-win-hostclone'
+          artifact-name:   'smoke-windows-hostclone-${{ github.run_id }}'
+
+  smoke-linux-hostclone:
+    runs-on: linux-build
+    steps:
+      - uses: https://gitea.emulab.it/Simone/local-ci-cd-system/.gitea/actions/local-ci-build@main
+        with:
+          build-command:   'mkdir -p /opt/ci/output && echo smoke-ok > /opt/ci/output/smoke.txt'
+          artifact-source: '/opt/ci/output'
+          guest-os:        'Linux'
+          use-git-clone:   'false'
+          job-id-suffix:   'smoke-linux-hostclone'
+          artifact-name:   'smoke-linux-hostclone-${{ github.run_id }}'