Build shared GitHub contributor foundation #2

Goal

Make every public Codegeist repository legally, technically, and organizationally ready for external contributors.

Public coordination

• Roadmap: Codegeist Roadmap
• Canonical coordinating task: https://github.com/codegeist-ai/codegeist/blob/main/docs/tasks/T010_build-shared-github-contributor-foundation/task.md
• Core rollout: feat(community): establish contributor foundation #3, chore(community): link public contributor work #7, docs(community): finalize contributor foundation #8
• Agent Kit rollout: feat(community): establish contributor foundation codegeist-agent-kit#1, chore(community): link public contributor work codegeist-agent-kit#5
• Devcontainer Kit rollout: feat(community): establish contributor foundation codegeist-devcontainer-kit#1, chore(community): link public contributor work codegeist-devcontainer-kit#5

Completion

The shared policies, 0BSD licensing, repository CI, contributor onboarding, Roadmap structure, accepted-work publication model, metadata, private vulnerability reporting, licensed kit releases, and protected default branches are published and verified. Placeholder contributor work created only for the rollout has been removed. All five public repositories report a 100 percent GitHub community profile.