feat(compat): sweep of components against the real core with strict diagnostics

tests/compat/cache/assert.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# Smoke HTTP del paquete cache (APCu sólo existe en SAPI web).
+set -u
+
+check() {
+  local comp="$1" path="$2" expect="$3" body
+  if ! body="$(curl -fsS "$BASE$path" 2>/dev/null)"; then
+    echo "$PKG:$comp|fail" >> "$RESULTS"; return
+  fi
+  if printf '%s' "$body" | grep -qF "$expect"; then
+    echo "$PKG:$comp|ok" >> "$RESULTS"
+  else
+    echo "     inesperado en $path: $(printf '%s' "$body" | head -c 200)" >&2
+    echo "$PKG:$comp|fail" >> "$RESULTS"
+  fi
+}
+
+check apcache /compat/cache/apcache 'APC_OK'