revert: roll back version bump, return to 0.1.0

- restore lib/filterable/version.rb to 0.1.0
- restore CHANGELOG to the cliff-managed [Unreleased] state (the manual
  0.2.0 entry should never have been hand-written)

Author: Memli-Sheremeti

CHANGELOG.md

@@ -7,8 +7,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [0.2.0] - 2026-06-23
-
 ### Added
 
 - Initial extraction from the ledger-back codebase.
@@ -26,5 +24,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Dropped the Zeitwerk dependency in favour of explicit `require_relative`s,
   matching the other Fluence gems and keeping the guarded Railtie require clean.
 
-[Unreleased]: https://github.com/fluence-eu/filterable-ruby/compare/v0.2.0...HEAD
-[0.2.0]: https://github.com/fluence-eu/filterable-ruby/releases/tag/v0.2.0
+[Unreleased]: https://github.com/fluence-eu/filterable-ruby/commits/main

lib/filterable/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Filterable
-  VERSION = '0.2.0'
+  VERSION = '0.1.0'
 end