docs: update documentation for accuracy after plugin system launch
- README: mark plugin system as shipped in roadmap - SPEC: update adapter table with openclaw_gateway, gemini-local, hermes_local - SPEC: update plugin architecture section to reflect shipped status - Add .doc-review-cursor for future maintenance runs Co-Authored-By: Paperclip <noreply@paperclip.ing> Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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