sync-status: add cosmos/CometBFT handler (gaiad + cosmos batch)

Cosmos-hub has NO EVM RPC — eth_blockNumber checks don't apply. Add a --cosmos
handler that probes the CometBFT /status method: sync_info.catching_up=false =>
online, else syncing; optional head-gap check vs the drpc reference. sync-status.sh
dispatches protocol=cosmos -> check-health.sh --cosmos. eth/starknet/aztec untouched.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

check-health.sh

@@ -10,15 +10,19 @@ fi
 RPC_URL=$1
 shift
 
-# Check for --starknet / --aztec flag
+# Check for --starknet / --aztec / --cosmos flag
 is_starknet=false
 is_aztec=false
+is_cosmos=false
 if [ "$1" == "--starknet" ]; then
     is_starknet=true
     shift
 elif [ "$1" == "--aztec" ]; then
     is_aztec=true
     shift
+elif [ "$1" == "--cosmos" ]; then
+    is_cosmos=true
+    shift
 fi
 
 REF=""
@@ -33,6 +37,28 @@ ref=${REF% }
 
 timeout=3 # seconds
 
+# CometBFT / cosmos (gaiad and the cosmos batch): no EVM RPC. Use the chain's own
+# sync_info from the CometBFT /status method — catching_up=false means caught up to head.
+# Short-circuits here; the EVM/starknet/aztec block-comparison path below is not used.
+if $is_cosmos; then
+    status=$(curl -L --ipv4 -m $timeout -s -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","id":1,"method":"status"}' "$RPC_URL")
+    if [ $? -ne 0 ] || [ -z "$status" ]; then echo "timeout"; exit 1; fi
+    catching_up=$(echo "$status" | jq -r '.result.sync_info.catching_up' 2>/dev/null)
+    node_height=$(echo "$status" | jq -r '.result.sync_info.latest_block_height' 2>/dev/null)
+    if [ -z "$node_height" ] || [ "$node_height" = "null" ]; then echo "error"; exit 1; fi
+    if [ "$catching_up" = "true" ]; then echo "syncing"; exit 1; fi
+    # catching_up=false => synced. If a reference endpoint is given, sanity-check head gap.
+    if [ -n "$ref" ]; then
+        ref_status=$($BASEPATH/multicurl.sh -L --ipv4 -m $timeout -s -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","id":1,"method":"status"}' $ref)
+        ref_height=$(echo "$ref_status" | jq -r '.result.sync_info.latest_block_height' 2>/dev/null)
+        if [ -n "$ref_height" ] && [ "$ref_height" != "null" ] && [ "$ref_height" -gt 0 ] 2>/dev/null; then
+            gap=$(( ref_height - node_height ))
+            if [ "$gap" -gt 100 ]; then echo "behind ($gap)"; exit 1; fi
+        fi
+    fi
+    echo "online"; exit 0
+fi
+
 response_file=$(mktemp)
 
 # Use appropriate RPC method based on chain type

sync-status.sh

@@ -54,7 +54,7 @@ for path in $pathlist; do
         fi
 
         case "$protocol" in
-            eth|starknet|aztec)
+            eth|starknet|aztec|cosmos)
                 ;;
             *)
                 # Protocol family known from the registry but no probe support
@@ -67,8 +67,10 @@ for path in $pathlist; do
 
         is_starknet=false
         is_aztec=false
+        is_cosmos=false
         [ "$protocol" = "starknet" ] && is_starknet=true
         [ "$protocol" = "aztec" ] && is_aztec=true
+        [ "$protocol" = "cosmos" ] && is_cosmos=true
 
         ref=''
         if [ -n "$2" ]; then
@@ -127,6 +129,12 @@ for path in $pathlist; do
                     echo "error"
                     exit 1
                 fi
+            elif $is_cosmos; then
+                # Cosmos/CometBFT: no chainid. Reference by drpc slug (optional — the node's
+                # own sync_info.catching_up is authoritative; ref only adds a head-gap check).
+                if [ -n "$chain_slug" ]; then
+                    ref=$($BASEPATH/reference-rpc-endpoint.sh --chain "$chain_slug" 2>/dev/null) || ref=""
+                fi
             else
                 # Ethereum chain ID detection
                 chain_id_response=$(curl -L --ipv4 -m 1 -s -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}' $RPC_URL)
@@ -155,6 +163,8 @@ for path in $pathlist; do
             $BASEPATH/check-health.sh "$RPC_URL" --aztec $ref
         elif $is_starknet; then
             $BASEPATH/check-health.sh "$RPC_URL" --starknet $ref
+        elif $is_cosmos; then
+            $BASEPATH/check-health.sh "$RPC_URL" --cosmos $ref
         else
             $BASEPATH/check-health.sh "$RPC_URL" $ref
         fi