chore(coprocessor): update poll-interval-ms default to 6s

Set default poll interval to 6000ms (half Ethereum block time) for more
efficient polling without missing blocks.

Author: obatirou

charts/coprocessor/values.yaml

@@ -253,7 +253,7 @@ hostListenerPoller:
     ### Polling and block processing parameters
     - --finality-lag=3
     - --batch-size=100  # Maximum number of blocks to process per iteration
-    - --poll-interval-ms=1000  # Sleep duration between iterations in milliseconds
+    - --poll-interval-ms=6000  # Sleep duration between iterations in milliseconds (half block time ~6s for Ethereum)
     - --retry-interval-ms=1000  # Backoff between retry attempts for RPC/DB failures in milliseconds
     - --max-http-retries=45  # Maximum number of HTTP/RPC retry attempts before failing an operation
     - --rpc-compute-units-per-second=1000  # Rate limiting budget for RPC calls during block catchup (compute units per second)

coprocessor/fhevm-engine/host-listener/src/bin/poller.rs

@@ -49,7 +49,7 @@ struct Args {
 
     #[arg(
         long,
-        default_value_t = 1000,
+        default_value_t = 6000, // half block time ~6s for Ethereum
         help = "Sleep duration between iterations in milliseconds"
     )]
     poll_interval_ms: u64,