Add theta: agent self-improvement via GitHub PRs

AgentSpeak v2: integrate with Claude Code Agent Teams

Update pricing to Claude Opus 4.6 ($5 input/$25 output), remove article from repo

Add dev.to article with mermaid diagrams and real benchmark data

Add real benchmark results to README with per-agent and cost breakdowns

Remove node_modules from tracking, add .gitignore

Add token benchmark with real session data

Initial release: AgentSpeak protocol for Claude Code agent teams