setup.sh had an interactive git-sync flow (git init, .gitignore, remote,
a generated sync.sh, optional cron) that `obsidian-wiki setup` — the entry
point pip/uv installs actually run — never had, so those installs silently
skipped it and .env.example documented a var nothing ever read.
Move the git plumbing into obsidian_wiki/sync.py (configure_sync/run_sync/
get_remote) and expose it as `obsidian-wiki sync-setup <url>` and
`obsidian-wiki sync`. `obsidian-wiki setup` now offers the same interactive
prompt setup.sh always had (or accepts --remote non-interactively), and
setup.sh's own prompt delegates into the same module via the CLI instead of
re-implementing it. Sync status is read live from the vault's own `git
remote` (via `obsidian-wiki info`) rather than a config var that could drift.
Mike Tsai