fix: consolidate version display to main README.md only

Version standardization:
- Move version to main README.md title: "Claude Code Marketplace - v2.2.0"
- Remove version from plugins/projman/README.md title
- Remove version from plugins/projman/CONFIGURATION.md title
- Remove version from plugin listings in README.md
- Remove "Key Features (v2.2.0)" -> "Key Features"
- Remove Version section from plugins/projman/README.md
- Remove version references from CLAUDE.md structure comments

Added versioning rule to CLAUDE.md:
- Version displayed ONLY in main README.md title
- Do NOT add versions to plugin docs or config guides
- Version history maintained in CHANGELOG.md only

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

plugins/projman/README.md

@@ -1,4 +1,4 @@
-# Projman v2.2.0 - Project Management for Claude Code
+# Projman - Project Management for Claude Code
 
 Sprint planning and project management plugin with full Gitea integration.
 
@@ -479,16 +479,6 @@ See [CONFIGURATION.md](./CONFIGURATION.md) for detailed configuration instructio
 
 MIT License - See repository root for details
 
-## Version
-
-**Current:** 2.2.0
-
-**Changelog:**
-- v2.2.0: Added `/review` and `/test-check` commands, code-reviewer agent, marketplace compliance updates
-- v2.1.0: Documentation improvements, canonical paths, initial-setup command
-- v2.0.0: Full Gitea integration with wiki, milestones, dependencies, parallel execution
-- v1.0.0: Initial release with basic commands
-
 ---
 
 **Status:** Production Ready