docs: expand 0.1.0 changelog with full API surface

Author: enilsen16

CHANGELOG.md

@@ -4,7 +4,21 @@
 
 ### Features
 
-- Wire codec (`Varint`, `ZigZag`, `Tag`, `WireType`), framing + scalar
-  codecs (`WireReader`, `WireWriter`, `Scalar`, `LE`), UTF-8 validator,
-  typed `WireError` union. 54 tests including property-based roundtrips
-  for every protobuf scalar and fuzz tests on the readers.
+- **Varint codec** — `Varint` encodes/decodes unsigned varints;
+  `ZigZag` handles sint32/sint64 zig-zag encoding.
+- **Tag codec** — `Tag` and `TagCodec` encode/decode field-number + wire-type
+  pairs; `TagDecoded` carries the result.
+- **Wire types** — `WireType` union (`WireVarint`, `WireFixed64`,
+  `WireLenDelim`, `WireFixed32`) with `WireTypeFromValue` dispatcher.
+- **Scalar codec** — `Scalar` covers all proto3 scalar types (bool,
+  int32/64, uint32/64, sint32/64, fixed32/64, sfixed32/64, float, double,
+  string, bytes), mapping each to its correct wire encoding.
+- **Little-endian framing** — `LE` reads/writes 32- and 64-bit fixed values.
+- **Streaming reader/writer** — `WireReader` and `WireWriter` provide
+  sequential encode/decode over `Array[U8]` buffers.
+- **UTF-8 validator** — rejects invalid byte sequences before they reach
+  string fields.
+- **Typed errors** — `WireError` union (`WireTruncated`, `WireOverflow`,
+  `WireBadTag`, `WireInvalidUtf8`) gives callers precise failure reasons.
+- 54 tests including property-based roundtrips for every scalar type and
+  fuzz tests confirming arbitrary bytes never panic the readers.