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

tests/compat/test/assert.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+# Smoke test:harness — runner real (phpunit via composer) en el proyecto temporal.
+# Recibe PROJ, PKG, RESULTS.
+set -u
+
+res() { echo "$PKG:harness|$1" >> "$RESULTS"; }
+
+cd "$PROJ" || { res fail; exit 0; }
+
+if [ ! -f composer.json ]; then
+  printf '{"name":"duckbrain/compat-probe","require":{}}\n' > composer.json
+fi
+
+if ! COMPOSER_NO_INTERACTION=1 composer require --dev phpunit/phpunit:^11.0 fakerphp/faker \
+     --no-interaction >/dev/null 2>"$PROJ/../composer.err"; then
+  echo "     composer require fallo:" >&2
+  sed 's/^/       /' "$PROJ/../composer.err" >&2
+  res fail
+  exit 0
+fi
+
+if ! ./vendor/bin/phpunit >/dev/null 2>"$PROJ/../phpunit.err"; then
+  echo "     phpunit fallo:" >&2
+  sed 's/^/       /' "$PROJ/../phpunit.err" >&2
+  res fail
+  exit 0
+fi
+
+res ok