docs(wiki): populate with Home + 4 contributor pages Replaces the GitHub-default placeholder Home with a real wiki: Home — orientation + what-lives-where map Getting-Started — install through "first paper added" in 10 min Architecture — high-level overview, points at in-tree docs/ Adding-Features — recipes for the most common changes Contributing — branch + commit + test + doc discipline Boundary with in-tree docs: the wiki is for project-level guidance that doesn't reference specific code paths (workflows, conventions, contributor onboarding). docs/ in-tree carries architecture and how-tos that name code paths and need to evolve with the codebase. The wiki links to the in-tree docs rather than duplicating them.