feat: rename project to Autonomous Dev Kit

[intel352]

Summary

• Rename claude-superpowers/Superpowers branding to Autonomous Dev Kit and autodev.
• Add host-neutral hook compatibility, hook contract tests, condensed skill guidance, global design guidance, phase progression, and relaxed backport/design-lock behavior.
• Update Claude marketplace, Codex/OpenCode docs, author metadata, release notes, and manifests for v6.0.0.

Verification

• jq . .claude-plugin/plugin.json .claude-plugin/marketplace.json .cursor-plugin/plugin.json >/dev/null && ./tests/version-check.sh
• ./tests/hook-contracts.sh
• ./tests/skill-cross-refs.sh && ./tests/skill-content-grep.sh && ./tests/skill-compression-notes.sh && ./tests/plan-scope-check.sh && ./tests/opencode/test-skills-core.sh
• node -c lib/skills-core.js && node -c .opencode/plugins/autodev.js
• git diff --check HEAD^ HEAD