feat: consolidate AI rules into unified AGENTS.md (#501)

- Merge all AI rules from .rules.md, .cursorrules, and CLAUDE.md into AGENTS.md
- Add competitor keyword prohibition rules (minio, ceph, swift, etc.)
- Simplify rules by removing overly detailed code examples
- Integrate new development principles as highest priority
- Remove old tool-specific rule files
- Fix clippy warnings for format string improvements

crates/ahm/src/scanner/node_scanner.rs

@@ -1007,7 +1007,7 @@ impl NodeScanner {
                     let object_size = self.estimate_object_size(&entry_path).await;
 
                     let entry = ScanResultEntry {
-                        object_path: format!("{}/{}", bucket_name, object_name),
+                        object_path: format!("{bucket_name}/{object_name}"),
                         bucket_name: bucket_name.to_string(),
                         object_size,
                         is_healthy: true, // assume most objects are healthy
@@ -1047,7 +1047,7 @@ impl NodeScanner {
         // simulate some scan results
         for i in 0..5 {
             let entry = ScanResultEntry {
-                object_path: format!("/fallback-bucket/object_{}", i),
+                object_path: format!("/fallback-bucket/object_{i}"),
                 bucket_name: "fallback-bucket".to_string(),
                 object_size: 1024 * (i + 1),
                 is_healthy: true,