cronos-testnet: new pruned node compose (cronostestnet_338-3)

Verified from crypto-org-chain/cronos-testnets: genesis, 3 official seeds,
t3 statesync RPC, basetcro denom; official daily snapshots exist for restore
(sidesteps the cosmos binary-upgrade gauntlet). Closes the planner's
'cronos-testnet: no known node_path' escalation.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

compose_registry.json

@@ -1902,6 +1902,21 @@
       "cronos-mainnet-cronos-pruned_config"
     ]
   },
+  {
+    "chain": "testnet",
+    "client": "cronos",
+    "compose_file": "cronos/cronos/cronos-testnet-cronos-pruned",
+    "features": [],
+    "network": "cronos",
+    "node": "config",
+    "relay": null,
+    "stack": null,
+    "type": "pruned",
+    "volumes": [
+      "cronos-testnet-cronos-pruned",
+      "cronos-testnet-cronos-pruned_config"
+    ]
+  },
   {
     "chain": "zkevm-mainnet",
     "client": "external-node",