fix: read_pom fallback returned both artifactId and version

When xmllint is not in PATH, the grep fallback in read_pom() captured
both <artifactId> and <version> in a single multi-line string and
returned it for every call. Concatenating it with ':' produced an
invalid Docker tag like:

    test-quarkus\n1.0.0-SNAPSHOT:test-quarkus\n1.0.0-SNAPSHOT

causing 'docker build' to fail with 'invalid reference format'.

Add a third 'tag' argument to read_pom() so the fallback extracts
only the requested element, and pass 'artifactId' / 'version' from
the call sites.

Also enrich pom.xml with <name> and <description> for Maven/IDE
metadata, without changing the image identity.

Tests cover the no-xmllint path explicitly (PATH stripped to
reproduce the vm-compilador environment) and the override path.

scripts/build-and-push.sh

@@ -102,14 +102,14 @@ EOF
 }
 
 read_pom() {
-  local xpath="$1" fallback="$2"
+  local xpath="$1" fallback="$2" tag="${3:-}"
   local value=""
   if command -v xmllint >/dev/null 2>&1; then
     value=$(xmllint --xpath "string($xpath)" pom.xml 2>/dev/null || true)
   fi
-  if [[ -z "$value" ]]; then
-    value=$(grep -E "<artifactId>|<version>" pom.xml | head -2 \
-            | sed -E 's:.*<(artifactId|version)>(.*)</\1>.*:\2:')
+  if [[ -z "$value" && -n "$tag" ]]; then
+    value=$(grep -E "<${tag}>" pom.xml | head -1 \
+            | sed -E "s:.*<${tag}>(.*)</${tag}>.*:\1:")
   fi
   printf '%s' "${value:-$fallback}"
 }
@@ -201,8 +201,8 @@ fi
 PROJECT_DIR="$(pwd)"
 
 # ---------- defaults ----------
-[[ -z "$IMAGE_NAME" ]] && IMAGE_NAME=$(read_pom "/*[local-name()='project']/*[local-name()='artifactId']" "test-quarkus")
-[[ -z "$IMAGE_TAG"  ]] && IMAGE_TAG=$(read_pom  "/*[local-name()='project']/*[local-name()='version']"     "1.0.0-SNAPSHOT")
+[[ -z "$IMAGE_NAME" ]] && IMAGE_NAME=$(read_pom "/*[local-name()='project']/*[local-name()='artifactId']" "test-quarkus" "artifactId")
+[[ -z "$IMAGE_TAG"  ]] && IMAGE_TAG=$(read_pom  "/*[local-name()='project']/*[local-name()='version']"     "1.0.0-SNAPSHOT" "version")
 [[ -z "$REMOTE"     ]] && die "Missing --remote USER@HOST[:PORT] (use --help)."
 
 IMAGE_REF="${IMAGE_NAME}:${IMAGE_TAG}"