feat(lambda): add AWS Lambda integration in examples/integrations/aws_lambda/ (#177)

feat(lambda): add AWS Lambda one-shot scrape integration

Self-contained example in examples/integrations/aws_lambda/ — Dockerfile,
entrypoint, handler, and docs for running CloakBrowser stealth scrapes in
AWS Lambda (container image). Includes smart_wait DOM-stability polling,
Xvfb headed mode, and Lambda-specific Chromium flags.

Contributed by @AlexTech314.

examples/integrations/aws_lambda/lambda-entrypoint.sh

@@ -0,0 +1,35 @@
+#!/bin/sh
+# Dual-mode entrypoint for the CloakBrowser Lambda image.
+#
+#   1. Always start Xvfb on :99 (same as the canonical bin/docker-entrypoint.sh)
+#      so headed Chromium works no matter how the container is invoked.
+#   2. Detect whether the CMD looks like a Lambda handler (a single
+#      `module.func`-shaped argument). If yes, route through the Lambda runtime
+#      client (using the bundled aws-lambda-rie locally, or talking to the real
+#      Lambda Runtime API when AWS_LAMBDA_RUNTIME_API is set in production).
+#   3. Otherwise exec the CMD directly — preserving the canonical Dockerfile's
+#      interaction surface (`python`, `cloakserve`, `cloaktest`, `node`, `bash`,
+#      `python examples/basic.py`, etc.).
+set -e
+
+mkdir -p /tmp/.X11-unix
+chmod 1777 /tmp/.X11-unix 2>/dev/null || true
+
+Xvfb :99 -screen 0 1920x1080x24 -nolisten tcp >/tmp/Xvfb.log 2>&1 &
+sleep 0.5
+
+# Lambda handler shape: exactly one arg, dotted identifier (no spaces, no slashes,
+# no leading dot). `python`, `cloakserve`, `cloaktest`, `bash`, `node` all fail
+# this test and pass through to plain exec.
+if [ $# -eq 1 ] && \
+   echo "$1" | grep -qE '^[a-zA-Z_][a-zA-Z0-9_]*(\.[a-zA-Z_][a-zA-Z0-9_]*)+$'; then
+    if [ -z "${AWS_LAMBDA_RUNTIME_API}" ]; then
+        # Local invocation via bundled RIE.
+        exec /usr/local/bin/aws-lambda-rie /usr/local/bin/python -m awslambdaric "$@"
+    else
+        # Real Lambda — runtime API endpoint already provided by the platform.
+        exec /usr/local/bin/python -m awslambdaric "$@"
+    fi
+fi
+
+exec "$@"