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/stats_aggregator.rs

@@ -203,7 +203,7 @@ impl NodeClient {
             .get(url)
             .send()
             .await
-            .map_err(|e| Error::Other(format!("HTTP request failed: {}", e)))?;
+            .map_err(|e| Error::Other(format!("HTTP request failed: {e}")))?;
 
         if !response.status().is_success() {
             return Err(Error::Other(format!("HTTP status error: {}", response.status())));
@@ -212,7 +212,7 @@ impl NodeClient {
         let summary = response
             .json::<StatsSummary>()
             .await
-            .map_err(|e| Error::Serialization(format!("deserialize stats data failed: {}", e)))?;
+            .map_err(|e| Error::Serialization(format!("deserialize stats data failed: {e}")))?;
 
         Ok(summary)
     }