chore: release v5.5.0

- RFC System for Feature Tracking
- 5 new commands: /rfc-create, /rfc-list, /rfc-review, /rfc-approve, /rfc-reject
- New MCP tool: allocate_rfc_number
- Sprint integration: /sprint-plan detects approved RFCs
- Clarity-assist integration: feature request detection

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to the Leo Claude Marketplace will be documented in this fil
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
-## [Unreleased]
+## [5.5.0] - 2026-02-01
 
 ### Added