feat(sozo): warn instead of hard error on RPC spec version mismatch (#3402)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: kariy

bin/sozo/src/utils.rs

@@ -120,13 +120,25 @@ pub async fn get_world_diff_and_provider(
     let provider = Arc::try_unwrap(provider).map_err(|_| anyhow!("Failed to unwrap Arc"))?;
     trace!(?provider, "Provider initialized.");
 
-    let spec_version = provider.spec_version().await?;
-    trace!(spec_version);
-
-    if !is_compatible_version(&spec_version, RPC_SPEC_VERSION)? {
-        return Err(anyhow!(
-            "Unsupported Starknet RPC version: {spec_version}, expected {RPC_SPEC_VERSION}.",
-        ));
+    match provider.spec_version().await {
+        Ok(spec_version) => {
+            trace!(spec_version);
+            match is_compatible_version(&spec_version, RPC_SPEC_VERSION) {
+                Ok(true) => {}
+                Ok(false) => ui.warn(format!(
+                    "Starknet RPC version mismatch: node reports {spec_version}, sozo was built \
+                     against {RPC_SPEC_VERSION}. Continuing anyway; operations may fail if RPC \
+                     methods differ."
+                )),
+                Err(e) => ui.warn(format!(
+                    "Could not parse Starknet RPC version '{spec_version}': {e}. Continuing."
+                )),
+            }
+        }
+        Err(e) => ui.warn(format!(
+            "Could not query Starknet RPC version: {e}. Continuing; operations may fail if RPC \
+             methods differ."
+        )),
     }
 
     let chain_id = provider.chain_id().await?;