Add rate-limit module: Bucket4j 8.21 token buckets on Redis in a Spring Boot 4.1 filter, per-user/per-key/global limits, 429 with Retry-After, two instances sharing one bucket

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b7rnC7jppGGdHGESvy

rate-limit/scripts/run-all.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+# Regenerates every file under output/.
+#
+#   ./scripts/run-all.sh
+#
+# Needs a JDK 25, Maven 3.9 and redis-server and redis-cli (7.x) on the PATH. The tests start
+# throwaway redis-server processes on free ports and stop them when the JVM exits; they never touch
+# a Redis on 6379. Transcripts 00-07 come out of the test suite, so each number in them is an
+# assertion that fails the build if it stops being true. Transcript 08 is two real JVMs and curl.
+set -euo pipefail
+cd "$(dirname "$0")/.."
+mkdir -p output
+
+echo "== test suite (transcripts 00-07)"
+mvn -B test | tee /tmp/rate-limit-mvn.log | grep -E '^\[(INFO|WARNING|ERROR)\] Tests run:' | sed 's/^\[[A-Z]*\] //' > output/00-test-summary.txt
+
+echo "== two real JVMs (transcript 08)"
+./scripts/two-jvms.sh >/dev/null
+
+echo
+echo "output:"
+ls -1 output