system: update doc commands and remove mutex

The mutex is not really doing anything, none of these methods make sense when called concurrently anyway. The copylocks analysis is still satisfied by the noCopy struct.

Signed-off-by: Ophestra <cat@gensokyo.uk>

system/mkdir_test.go

@@ -19,9 +19,9 @@ func TestEnsure(t *testing.T) {
 	}
 	for _, tc := range testCases {
 		t.Run(tc.name+"_"+tc.perm.String(), func(t *testing.T) {
-			sys := New(150)
+			sys := New(t.Context(), 150)
 			sys.Ensure(tc.name, tc.perm)
-			(&tcOp{User, tc.name}).test(t, sys.ops, []Op{&Mkdir{User, tc.name, tc.perm, false}}, "Ensure")
+			(&tcOp{User, tc.name}).test(t, sys.ops, []Op{&MkdirOp{User, tc.name, tc.perm, false}}, "Ensure")
 		})
 	}
 }
@@ -36,9 +36,9 @@ func TestEphemeral(t *testing.T) {
 	}
 	for _, tc := range testCases {
 		t.Run(tc.path+"_"+tc.perm.String()+"_"+TypeString(tc.et), func(t *testing.T) {
-			sys := New(150)
+			sys := New(t.Context(), 150)
 			sys.Ephemeral(tc.et, tc.path, tc.perm)
-			tc.test(t, sys.ops, []Op{&Mkdir{tc.et, tc.path, tc.perm, true}}, "Ephemeral")
+			tc.test(t, sys.ops, []Op{&MkdirOp{tc.et, tc.path, tc.perm, true}}, "Ephemeral")
 		})
 	}
 }
@@ -60,7 +60,7 @@ func TestMkdirString(t *testing.T) {
 	}
 	for _, tc := range testCases {
 		t.Run(tc.want, func(t *testing.T) {
-			m := &Mkdir{
+			m := &MkdirOp{
 				et:        tc.et,
 				path:      container.Nonexistent,
 				perm:      0701,