Add self-improving-operator plugin

[wd041216-bit]

Summary

This PR adds a new Claude Code plugin, self-improving-operator, to the marketplace.

It is a proactive project-ownership plugin that helps Claude Code inspect the current state of a project, choose one high-leverage bounded improvement, verify the outcome, and refresh handoff guidance instead of stopping after a single narrow edit.

What is included

• Marketplace entry in .claude-plugin/marketplace.json
• README links in both README.md and README-zh.md
• New plugin folder at plugins/self-improving-operator/
  • .claude-plugin/plugin.json
  • agents/self-improving-operator-executor.md
  • skills/improve-project/SKILL.md
  • skills/operator-playbook/SKILL.md
  • README.md
  • LICENSE

Canonical repository

https://github.com/wd041216-bit/claude-code-self-improving-operator

Validation

• Validated plugin structure locally with a static validator
• Confirmed the public repository is live and the latest GitHub Actions validation run passed

[wd041216-bit]

Refreshed this PR to the v2 plugin bundle generated from the canonical autonomy kernel. The plugin now includes persistent .operator/ state, backlog refresh/next-item/checkpoint scripts, operator-flow docs and examples, generation manifest validation, and improved signal hygiene so only actionable work remains in the queue. The source plugin repo validation is green and this marketplace package matches the generated bundle.