A node type's sources wait for the build made from them

A portal serves a node type from a compiled build, and that build was made from one exact set of source files. Keeping the two in step is what stops a type from suddenly rendering last week's code over today's data — or failing to compile at all.

Until now that was kept in step per repository: a content sync brought a space to the commit the portal's builds were made from. That is right, and it is not enough. The builds a portal holds are published per node type, and a publication can be complete, at the right commit, and still not contain the build for one particular type. The sync then moved that type's sources anyway, and the portal declined its own build as "not made from these sources" — the type kept serving, marked as behind, until a newer build arrived.

Now the sync asks per type. A type whose compiled build is verified against the sources it has keeps those sources unless a build made from the repository's newer ones is already on the portal:

• Everything else in the space syncs normally — the hold is one type's sources, not the space.
• The space's sync record says so: it still shows the commit it genuinely holds, names each held type, and says which build it is waiting for.
• The sync activity says so too, in your language, with the types named.
• It releases by itself when that build arrives, when the repository produces a commit whose build the portal has, or when the portal is rolled onto a platform that has one.

Nothing is held when there is nothing to protect: a type the portal compiles itself, a type already behind its sources, a space whose repository the portal runs no compiled builds of, and a portal that consumes no published builds at all are all unaffected. Nor is anything held when the portal cannot READ the builds it holds — the arrival of a build is what ends a hold, so a hold taken without being able to see the builds would have nothing that could end it; the sync proceeds and the type says it is behind, as it did before.

The design, including what a partially-held space means for the recorded commit: Adopt Then Sync, Per NodeType.