Fix revive style issues (bd-56)

- Fix 14 unused-parameter warnings (rename to _)
- Fix 2 redefines-builtin-id (max→maxCount, min→minInt)
- Fix 3 indent-error-flow issues with gofmt
- Merged duplicate bd-126 into bd-116

internal/rpc/metrics.go

@@ -225,9 +225,9 @@ func calculateLatencyStats(samples []time.Duration) LatencyStats {
 
 	n := len(sorted)
 	// Calculate percentiles with defensive clamping
-	p50Idx := min(n-1, n*50/100)
-	p95Idx := min(n-1, n*95/100)
-	p99Idx := min(n-1, n*99/100)
+	p50Idx := minInt(n-1, n*50/100)
+	p95Idx := minInt(n-1, n*95/100)
+	p99Idx := minInt(n-1, n*99/100)
 
 	// Calculate average
 	var sum time.Duration
@@ -251,7 +251,7 @@ func calculateLatencyStats(samples []time.Duration) LatencyStats {
 	}
 }
 
-func min(a, b int) int {
+func minInt(a, b int) int {
 	if a < b {
 		return a
 	}

internal/rpc/server.go

@@ -140,7 +140,7 @@ func NewServer(socketPath string, store storage.Storage) *Server {
 }
 
 // Start starts the RPC server and listens for connections
-func (s *Server) Start(ctx context.Context) error {
+func (s *Server) Start(_ context.Context) error {
 	if err := s.ensureSocketDir(); err != nil {
 		return fmt.Errorf("failed to ensure socket directory: %w", err)
 	}