• a42b3a1 add concurrency limiter to prevent oom under burst load
• 182d3dc surface browser pool exhaustion as 429 not 500
• 002e55d add scripts/test-scrape-burst.sh for /scrape load testing
• 6cfa87c bump default browser pool size to 3
• efaf0c9 make acquire timeout configurable, default 15s
• 59ba779 document BROWSER_ACQUIRE_TIMEOUT_MS and HTTP 429 on pool exhaustion
• 83c30c6 fix BROWSER_POOL_SIZE default, document BROWSER_ACQUIRE_TIMEOUT_MS