test: cross-repo (qualified-ref) workflow_call probe for Phase 4

.gitea/workflows/zz-xrepo-caller.yml

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+# THROWAWAY cross-repo-resolution probe for Phase 4 — delete after.
+# Uses a fully-qualified owner/repo/path@ref reference (the Phase-4 mechanism),
+# not a local ./path one — exercises Gitea's external-workflow resolution.
+name: zz-xrepo-caller
+on:
+  push:
+    branches: [wf-xrepo-probe]
+jobs:
+  call-qualified:
+    uses: steve/gadfly/.gitea/workflows/zz-xrepo-reusable.yml@wf-xrepo-probe
+    secrets: inherit

.gitea/workflows/zz-xrepo-reusable.yml

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+# THROWAWAY cross-repo-resolution probe for Phase 4 — delete after.
+name: zz-xrepo-reusable
+on:
+  workflow_call: {}
+jobs:
+  probe:
+    runs-on: ubuntu-latest
+    steps:
+      - env:
+          S: ${{ secrets.OLLAMA_CLOUD_API_KEY }}
+        run: |
+          if [ -n "$S" ]; then echo "XREPO_PROBE_RESULT=SECRET_PRESENT"; else echo "XREPO_PROBE_RESULT=SECRET_ABSENT"; fi