Almanac

First maintainer-reviewed pass for SN41 (previously community-seeded/unreviewed, categories empty, no website/source-repo surfaces despite website_url/source_repo already being set). Added the missing website and source-repo surfaces. Fixed 2 pre-existing surfaces having no probe config at all -- the registry-wide gap tracked in #5932. Replaced the hardcoded single-market snapshot surface (GET /api/markets/events/202857, pinned to a specific "NFL Champion 2027" event with no stable canonical value -- it will inevitably go stale once that market resolves around Feb 2027) with GET /api/markets, a genuine no-parameter, evergreen listing of all markets on the same host (same reasoning as #5914/#5934).