release: floret-kit 0.1.0

Finalize the 0.1.0 CHANGELOG entry (first tagged release). Consumed from
source via git submodule; tagging gives apps a stable, traceable pin.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

CHANGELOG.md

@@ -10,6 +10,8 @@ are no binary releases; "version" tracks the shared `version` in the root build
 
 ## [Unreleased]
 
+## [0.1.0] - 2026-07-07
+
 ### Added
 
 - **`core-time`** (JVM library) — pure-Kotlin date/time helpers, no Android and