style: Migrate to stable-only rustfmt configuration

- Remove nightly-only features from .rustfmt.toml and vendor/ss58-registry/rustfmt.toml
- Removed features: imports_granularity, wrap_comments, comment_width,
  reorder_impl_items, spaces_around_ranges, binop_separator,
  match_arm_blocks, trailing_semicolon, trailing_comma
- Format all 898 affected files with stable rustfmt
- Ensures long-term reliability without nightly toolchain dependency

pezcumulus/client/bootnodes/src/advertisement.rs

@@ -441,7 +441,7 @@ impl BootnodeAdvertisement {
 
 	fn handle_dht_event(&mut self, event: DhtEvent) {
 		match event {
-			DhtEvent::StartedProviding(key) =>
+			DhtEvent::StartedProviding(key) => {
 				if Some(&key) == self.current_epoch_key.as_ref() {
 					debug!(
 						target: LOG_TARGET,
@@ -454,7 +454,8 @@ impl BootnodeAdvertisement {
 						"Successfully published provider for next epoch key {}",
 						hex::encode(key.as_ref()),
 					);
-				},
+				}
+			},
 			DhtEvent::StartProvidingFailed(key) => {
 				if Some(&key) == self.current_epoch_key.as_ref() {
 					debug!(

pezcumulus/client/bootnodes/src/discovery.rs

@@ -180,9 +180,9 @@ impl BootnodeDiscovery {
 	/// Schedule bootnode discovery if needed. Returns `false` if the discovery event loop should be
 	/// terminated.
 	fn maybe_retry_discovery(&mut self) -> bool {
-		let discovery_in_progress = self.key_being_discovered.is_some() ||
-			!self.pending_responses.is_empty() ||
-			!self.find_node_queries.is_empty();
+		let discovery_in_progress = self.key_being_discovered.is_some()
+			|| !self.pending_responses.is_empty()
+			|| !self.find_node_queries.is_empty();
 		let discovery_scheduled = !self.pending_start_discovery.is_terminated();
 
 		if discovery_in_progress || discovery_scheduled {
@@ -310,8 +310,8 @@ impl BootnodeDiscovery {
 
 		match (response.genesis_hash, response.fork_id) {
 			(genesis_hash, fork_id)
-				if genesis_hash == self.teyrchain_genesis_hash &&
-					fork_id == self.teyrchain_fork_id => {},
+				if genesis_hash == self.teyrchain_genesis_hash
+					&& fork_id == self.teyrchain_fork_id => {},
 			(genesis_hash, fork_id) => {
 				warn!(
 					target: LOG_TARGET,