docs: add timestamps to CHANGELOG version entries

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [1.3.0] - 2025-03-18
+## [1.3.0] - 2026-03-18 18:51 UTC
 
 ### Added
 - **OpenRouter Integration** — 4th AI provider with API key auth, 20+ model support
@@ -74,7 +74,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Total project lines: ~10,179 across core files
 - System prompt PLAN MODE block added to: `qwen-oauth.ts`, `ollama-cloud.ts`, `zai-plan.ts`, `openrouter.ts`
 
-## [1.2.0] - 2025-01-19
+## [1.2.0] - 2026-01-19 19:16 UTC
 
 ### Added
 - **SEO Agent Behavior Fixes**
@@ -95,7 +95,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Updated Settings panel with improved UX for API key management
 - Enhanced agent selection behavior to prevent unintended switches
 
-## [1.1.0] - 2025-01-15
+## [1.1.0] - 2025-12-29 17:55 UTC
 
 ### Added
 - GitHub integration for pushing AI-generated artifacts
@@ -103,7 +103,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - High-fidelity HTML report generation
 - OAuth token management for Qwen API
 
-## [1.0.0] - 2025-01-01
+## [1.0.0] - 2025-12-29 13:51 UTC
 
 ### Added
 - Initial release of PromptArch