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

bizinikiwi/utils/pezframe/benchmarking-cli/src/machine/mod.rs

@@ -150,8 +150,9 @@ impl MachineCmd {
 
 		let score = match metric {
 			Metric::Blake2256 => benchmark_cpu(hash_limit),
-			Metric::Blake2256Parallel { num_cores } =>
-				benchmark_cpu_parallelism(hash_limit, *num_cores),
+			Metric::Blake2256Parallel { num_cores } => {
+				benchmark_cpu_parallelism(hash_limit, *num_cores)
+			},
 			Metric::Sr25519Verify => benchmark_sr25519_verify(verify_limit),
 			Metric::MemCopy => benchmark_memory(memory_limit),
 			Metric::DiskSeqWrite => benchmark_disk_sequential_writes(disk_limit, dir)?,