chore: release v5.4.0

- CHANGELOG.md: [Unreleased] → [5.4.0] - 2026-01-28
- README.md: title → v5.4.0
- marketplace.json: version → 5.4.0
- CLAUDE.md: version → 5.4.0

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

CLAUDE.md

@@ -46,7 +46,7 @@ Run `./scripts/verify-hooks.sh`. If changes affect MCP servers or hooks, inform
 ## Project Overview
 
 **Repository:** leo-claude-mktplace
-**Version:** 5.3.0
+**Version:** 5.4.0
 **Status:** Production Ready
 
 A plugin marketplace for Claude Code containing: