Introduce a two-part version scheme (major.minor) for documents.
Drafts start at 0.1 and increment minor on each new draft. Publishing
as minor keeps the current version, publishing as major bumps to the
next major.0. Both current_published_major and current_published_minor
are tracked on the document for exact version lookups.
Signatures and approval quorums aggregate across all versions sharing
the same major number using CTE joins. Approval page mutations spread
the decision fragment so Relay updates the version row state without
requiring a page refresh.
GraphQL, MCP, and service layer expose separate publishMajor and
publishMinor mutations instead of a single mutation with a type enum.
Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>
