Add resilience: Spring Framework 7 @Retryable and @ConcurrencyLimit

Companion code for "Spring Framework 7's Built-in Resilience: @Retryable,
@ConcurrencyLimit, and What's Left for Resilience4j". Every retry counted
by recording real invocations: defaults, backoff and jitter, timeout,
reactive and CompletableFuture returns, the concurrency limit's BLOCK and
REJECT policies, retries around transactions, composition with
Resilience4j 2.4.0, and the annotation API across 7.0.0-7.0.9.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01C3TETMrqVUWeFkNtz3Jbo3

resilience/scripts/run-all.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# Regenerate every transcript under docs/output/. About a minute and a half - several scenarios
+# sleep through Spring's one-second default delay on purpose.
+set -euo pipefail
+cd "$(dirname "$0")/.."
+source scripts/env.sh
+mvn -q -DskipTests package
+./scripts/run.sh
+./scripts/demo.sh retry defaults exhausted exponential jitter includes cause future mono timeout hang self-invocation
+./scripts/demo.sh tx standalone joined
+./scripts/demo.sh limit none block reject limit-and-retry r4j-bulkhead
+./scripts/demo.sh r4j retry breaker combo timelimiter
+./scripts/demo.sh proxy payments stock-writer reports gateway
+{
+  echo "# Spring retry has no metrics of its own; the only meter is the one RetryEvents registers."
+  echo "\$ curl /actuator/metrics | grep -iE 'retry|resilience4j'"
+  curl -s "$BASE/actuator/metrics" | python3 -c 'import json,sys
+print("\n".join(n for n in json.load(sys.stdin)["names"] if "retry" in n or "resilience4j" in n))'
+} > "$OUT/metrics-names.txt"
+./scripts/stop.sh
+EXTRA_ARGS=--demo.resilience.enabled=false ./scripts/run.sh
+{
+  echo "# The same @Retryable method with @EnableResilientMethods switched off (demo.resilience.enabled=false)"
+  echo
+  curl -s "$BASE/demo/retry/defaults" | python3 -m json.tool
+  echo
+  echo "# Startup log lines mentioning retry or resilience:"
+  grep -E 'Retr|Resilient|ConcurrencyLimit' "$LOG" | grep -v 'Picked up' || echo "(none)"
+} > "$OUT/retry-disabled.txt"
+./scripts/stop.sh
+./scripts/demo-api-surface.sh
+echo "Regenerated: $(ls docs/output | wc -l) files in docs/output/"