feat(aidd-vcs): add 00-repo-init skill (init + publish a repository)

[blafourcade]

Tracking issue for in-flight work in PR #269.

Created during roadmap review 2026-06-18 to surface active framework work on the board. See PR #269 for scope and discussion.

[blafourcade]

repo-init skill delivered in next (PR #269, commit 87c650c). Closing during roadmap verification.