(new): JSON HTML escaping control

- add Formatter.JSONEscapeHTML and SetJSONEscapeHTML to let JSON writers preserve HTML-sensitive characters when needed while keeping escaping enabled by default.
- switch JSON output to json.Encoder, preserve existing Print/Println newline semantics, and cover the new escaping behavior in tests.

RELEASE_NOTES.md

@@ -1,3 +1,26 @@
+# v2.3.0
+
+This release adds JSON HTML-escaping control while preserving the existing
+JSON writer defaults and newline semantics.
+
+### Added
+
+- Added `Formatter.SetJSONEscapeHTML(bool)` and `Formatter.JSONEscapeHTML` to control whether JSON writers escape HTML-sensitive characters such as `<`, `>`, and `&`.
+
+### Changed
+
+- JSON writers now use `json.Encoder` internally so formatter-level HTML escaping can be configured.
+
+### Fixed
+
+- Preserved `Print` and `Println` newline behavior for JSON output while switching to `json.Encoder`.
+
+### Compatibility
+
+- No breaking API changes.
+- HTML escaping remains enabled by default, matching the previous `encoding/json` behavior.
+- `Print` still emits JSON without an added newline, and `Println` emits exactly one trailing newline.
+
 # v2.2.0
 
 This release expands the public LogLevel API, adds optional threshold-based