diff --git a/scripts/check-phase3.sh b/scripts/check-phase3.sh
new file mode 100755
index 0000000..0393e7a
--- /dev/null
+++ b/scripts/check-phase3.sh
@@ -0,0 +1,67 @@
+#!/usr/bin/env bash
+# Repeatable Phase 3 verification: root and app vet/test/race, focused real
+# genres parity, corpus audit, and the Phase 2 harness regression.
+# Docker is required; unavailable Docker is a failed gate, never a skip.
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+APP="$(cd "$ROOT/../fonoteka.go" && pwd)"
+PHP_ROOT="${PHP_ROOT:-/media/nvme/dev/golem15/fonoteka}"
+ROUTES_PHP="$PHP_ROOT/plugins/golem15/fonoteka/routes.php"
+
+if ! command -v docker >/dev/null 2>&1; then
+	echo "refuse: docker is required for Phase 3 Postgres and PHP regression" >&2
+	exit 1
+fi
+if ! docker info >/dev/null 2>&1; then
+	echo "refuse: docker daemon is not available" >&2
+	exit 1
+fi
+
+run_module() {
+	local name="$1"
+	local dir="$2"
+	echo "==> ${name} (${dir})"
+	(
+		cd "$dir"
+		go vet ./...
+		go test ./...
+		go test -race ./...
+	)
+}
+
+echo "==> docker is available"
+run_module "root" "$ROOT"
+run_module "app" "$APP"
+
+echo "==> focused genres parity (one real ported pass)"
+(
+	cd "$APP"
+	go test ./parity -count=1 -run 'TestParityCorpus$'
+)
+
+echo "==> focused genre security and tenant isolation"
+(
+	cd "$APP"
+	go test ./parity -count=1 -run 'TestGenreSecurityBoundaries|TestGenreCountsScopedToActiveCollection|TestGenreQueryFailsOnWrongLocale'
+)
+
+echo "==> corpus audit"
+CORPUS_ARGS=(
+	--manifest "$APP/parity/manifest.yaml"
+	--require-recorded
+	--require-clients
+	--check-secrets
+)
+if [[ -f "$ROUTES_PHP" ]]; then
+	CORPUS_ARGS+=(--routes "$ROUTES_PHP")
+fi
+(
+	cd "$APP"
+	go run ./parity/check_corpus.go "${CORPUS_ARGS[@]}"
+)
+
+echo "==> Phase 2 harness regression"
+bash "$ROOT/scripts/check-phase2.sh" --fresh-php
+
+echo "phase3 check passed"