docs(changelog): release 1.0.0

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: malys

CHANGELOG.md

@@ -4,7 +4,14 @@ All notable changes to this project are documented here. Format follows
 [Keep a Changelog](https://keepachangelog.com/en/1.1.0/); versions follow
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [1.0.0] - 2026-08-02
+
+### Added
+
+- API key and token inputs are masked by default, with a password visibility
+  toggle sized for in-car touch targets.
+- CONTRIBUTING.md, DESIGN.md and this CHANGELOG.
+- Security issue template.
 
 ### Changed
 
@@ -23,3 +30,4 @@ All notable changes to this project are documented here. Format follows
   bitmap buckets are gone.
 - README restructured to the shared MG4Suite skeleton; table of contents is now
   generated by `tools/sync-docs.mjs`.
+- Repaired bug/feature issue templates (duplicate YAML key, field ordering).