refactor!: major directory restructuring and npx support

- Create agents/ directory, move bmad, requirements, development-essentials
- Remove docs/, hooks/, dev-workflow/ directories
- Add npx support via github:cexll/myclaude
- Add bin/cli.js with --update command for installed modules
- Add package.json, skills/README.md, PLUGIN_README.md
- Update all references across config.json, README, marketplace.json
- Change default module from dev to do
- Update CHANGELOG with all 59 tags

BREAKING CHANGE: Directory structure changed, docs/hooks removed

Generated with SWE-Agent.ai

Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>

.claude-plugin/marketplace.json

@@ -15,32 +15,25 @@
       "source": "./skills/omo",
       "category": "development"
     },
-    {
-      "name": "dev",
-      "description": "Lightweight development workflow with requirements clarification, parallel codex execution, and mandatory 90% test coverage",
-      "version": "5.6.1",
-      "source": "./dev-workflow",
-      "category": "development"
-    },
     {
       "name": "requirements",
       "description": "Requirements-driven development workflow with quality gates for practical feature implementation",
       "version": "5.6.1",
-      "source": "./requirements-driven-workflow",
+      "source": "./agents/requirements",
       "category": "development"
     },
     {
       "name": "bmad",
       "description": "Full BMAD agile workflow with role-based agents (PO, Architect, SM, Dev, QA) and interactive approval gates",
       "version": "5.6.1",
-      "source": "./bmad-agile-workflow",
+      "source": "./agents/bmad",
       "category": "development"
     },
     {
       "name": "dev-kit",
       "description": "Essential development commands for coding, debugging, testing, optimization, and documentation",
       "version": "5.6.1",
-      "source": "./development-essentials",
+      "source": "./agents/development-essentials",
       "category": "productivity"
     },
     {