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>

skills/README.md

@@ -0,0 +1,23 @@
+# Skills
+
+This directory contains agent skills (each skill lives in its own folder with a `SKILL.md`).
+
+## Install with `npx` (recommended)
+
+List installable items:
+
+```bash
+npx github:cexll/myclaude --list
+```
+
+Install (interactive; pick `skill:<name>`):
+
+```bash
+npx github:cexll/myclaude
+```
+
+Force overwrite / custom install directory:
+
+```bash
+npx github:cexll/myclaude --install-dir ~/.claude --force
+```