Add ChilliCream UnsignedByte scalar (#48)

* Add ChilliCream Byte scalar

* Add note about .NET type

* Remove references to .NET

* Rename to UnsignedByte

Author: glen-84

scalars/contributed/chillicream/unsigned-byte.md

@@ -0,0 +1,97 @@
+# UnsignedByte — GraphQL Custom Scalar
+
+Author – ChilliCream
+
+Date – 2025-12-29
+
+**License and Copyright**
+
+Copyright © GraphQL contributors. This specification is licensed under
+[OWFa 1.0](https://www.openwebfoundation.org/the-agreements/the-owf-1-0-agreements-granted-claims/owfa-1-0).
+
+# Overview
+
+The `UnsignedByte` scalar type represents an unsigned 8-bit integer. It is
+intended for scenarios where values are constrained to the range 0 to 255, such
+as representing color channel values (RGB), small counters, or byte-level data.
+
+Unlike the built-in `Int` scalar which represents signed 32-bit integers,
+`UnsignedByte` provides stronger type safety and validation for values that must
+fit within an unsigned 8-bit range.
+
+# Recommended name
+
+The recommended name for this scalar is `UnsignedByte`.
+
+# Result spec
+
+An `UnsignedByte` scalar must serialize to an integer value in the range 0 to
+255 (inclusive).
+
+## Examples
+
+These are valid result values:
+
+| Value | Explanation                  |
+| ----- | ---------------------------- |
+| `0`   | Minimum unsigned byte value. |
+| `255` | Maximum unsigned byte value. |
+| `128` | Mid-range value.             |
+
+These are invalid result values:
+
+| Value   | Why is it invalid                          |
+| ------- | ------------------------------------------ |
+| `-1`    | Negative values are not allowed.           |
+| `256`   | Exceeds maximum unsigned byte value (255). |
+| `3.14`  | Fractional values are not allowed.         |
+| `"128"` | Must be a number, not a string.            |
+
+# Input spec
+
+An `UnsignedByte` scalar accepts integer values in the range 0 to 255
+(inclusive), both as GraphQL literals and as JSON input values.
+
+Implementations should validate:
+
+- Value is an integer (no fractional component)
+- Value is between 0 and 255 (inclusive)
+- Value is not negative
+
+## Examples
+
+Valid input values:
+
+GraphQL Literal:
+
+```graphql
+mutation {
+  setColor(red: 255, green: 128, blue: 0) {
+    id
+  }
+}
+```
+
+JSON input:
+
+```json
+{
+  "red": 255,
+  "green": 128,
+  "blue": 0
+}
+```
+
+Invalid input values:
+
+| Value   | Why is it invalid                          |
+| ------- | ------------------------------------------ |
+| `-1`    | Negative values are not allowed.           |
+| `256`   | Exceeds maximum unsigned byte value (255). |
+| `3.14`  | Fractional values are not allowed.         |
+| `"128"` | Must be a number, not a string.            |
+
+# References
+
+- [GraphQL Specification - Int](https://spec.graphql.org/September2025/#sec-Int)
+  — Built-in integer scalar type