feat(encode): write the TOML 1.1 output form

Assisted-by: DeepSeek V4.1 Flash

CHANGELOG.md

@@ -27,6 +27,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- The output takes the TOML 1.1 form. A date-time writes its seconds only when
+  the value carries them and drops the trailing zeros of a fractional second,
+  so `07:32:00` is written `07:32` and half a second as `00.5`. Both are the
+  same value, and a document written without seconds now comes back without
+  them. `LocalDateTime.String()`, `LocalTime.String()` and the offset date-time
+  rendering follow the same rule.
+- An inline table that would pass the hundredth column is written across lines
+  with a trailing comma and one tab of indentation per nesting level, the shape
+  TOML 1.1 allows an inline table to take.
 - TOML 1.1 is the acceptance contract, and TOML 1.0 is not. The compliance
   suite runs the 1.1 corpus alone, and the promise that every 1.0 document
   parses exactly as before is withdrawn. Nothing that parses today stops