fix: force full build when no diff or stage-latest missing

.gitea/workflows/stage.yaml

@@ -82,7 +82,12 @@ jobs:
           echo "Changed files:"
           echo "$CHANGED"
           NON_ASSET=$(echo "$CHANGED" | grep -v '^src/assets/' | grep -v '^src/shares/' | grep -v '^src/index\.html' | grep -v '^src/about\.html' | grep -v '^src/terms\.html' | grep -v '^src/enterprise-terms\.html' | grep -v '^src/llms\.txt' | grep -v '^migrations/' | grep -v '^scripts/' | grep -v '^tests/' | grep -v '^\.gitea/' | grep -v '^$' || true)
-          if [ -z "$NON_ASSET" ] && [ "$CHANGED" != "unknown" ]; then
+          if [ -z "$CHANGED" ] || [ "$CHANGED" = "unknown" ]; then
+            # No diff (workflow_dispatch with no new commits, or git error).
+            # Registry may not have a stage-latest base image, so force full build.
+            echo "asset_only=false" >> "$GITHUB_OUTPUT"
+            echo "=> No changed files detected (workflow_dispatch?), forcing full build"
+          elif [ -z "$NON_ASSET" ]; then
             echo "asset_only=true" >> "$GITHUB_OUTPUT"
             echo "=> Asset-only change detected, will use fast path"
           else

Dockerfile.stage

@@ -9,6 +9,7 @@
 #
 # CI pre-build steps (in stage.yaml):
 #   - neuron-web: built by `elb build` → dist/neuron-landing
+# Last rebuilt: 2026-05-11
 
 FROM ubuntu:24.04