fix(playground): raise sandbox rate limit default 10→30 req/min (DAK-6835) (#201)

fix(playground): raise sandbox rate limit default 10→30 req/min (DAK-6835)

Compare mode fires 11 requests (10 stores + 1 recall), immediately hitting the old 10/min cap.
CEO already applied 30 on the live server; this persists it as the code default.

🤖 [Agent: CTO] Reviewed + merged

Author: ferhimedamine

docker/docker-compose.playground.yml

@@ -148,7 +148,7 @@ services:
       - PROXY_PORT=3100
       - DAKERA_UPSTREAM_URL=http://dakera:3000
       - DAKERA_ROOT_API_KEY=${DAKERA_ROOT_API_KEY:?Set DAKERA_ROOT_API_KEY in .env}
-      - SANDBOX_RATE_LIMIT_PER_MIN=${SANDBOX_RATE_LIMIT_PER_MIN:-10}
+      - SANDBOX_RATE_LIMIT_PER_MIN=${SANDBOX_RATE_LIMIT_PER_MIN:-30}
       - SANDBOX_MEMORY_CAP=${SANDBOX_MEMORY_CAP:-50}
       - SANDBOX_SESSION_TTL_SEC=${SANDBOX_SESSION_TTL_SEC:-1800}
       - SANDBOX_MAX_SESSIONS_PER_IP=${SANDBOX_MAX_SESSIONS_PER_IP:-20}

docker/playground/proxy/README.md

@@ -24,7 +24,7 @@ tiny container, no supply-chain surface).
 
 | # | Limit | Default | Env var |
 |---|-------|---------|---------|
-| 1 | Rate limit per session | 10 req / 60s sliding window | `SANDBOX_RATE_LIMIT_PER_MIN` |
+| 1 | Rate limit per session | 30 req / 60s sliding window | `SANDBOX_RATE_LIMIT_PER_MIN` |
 | 2 | Memory cap per session | 50 (batch items counted) | `SANDBOX_MEMORY_CAP` |
 | 3 | Session TTL | 30 min auto-expiry | `SANDBOX_SESSION_TTL_SEC` |
 | 4 | Endpoint allow-list | deny-by-default | (see `allowlist.js`) |

docker/playground/proxy/config.js

@@ -41,7 +41,7 @@ const config = {
   rootApiKey: process.env.DAKERA_ROOT_API_KEY || '',
 
   // Sandbox limits (DAK-6713 acceptance criteria)
-  rateLimitPerMin: intEnv('SANDBOX_RATE_LIMIT_PER_MIN', 10), // req #1
+  rateLimitPerMin: intEnv('SANDBOX_RATE_LIMIT_PER_MIN', 30), // req #1
   memoryCapPerSession: intEnv('SANDBOX_MEMORY_CAP', 50), //      req #2
   sessionTtlMs: intEnv('SANDBOX_SESSION_TTL_SEC', 30 * 60) * 1000, // req #3