A compile in flight no longer reads as a finished build

Installing a package retypes its partition root, then recycles that root so the hub which comes back binds the package's own configuration instead of the placeholder. The recycle has to wait for the root's in-package NodeType to actually produce a build — recycle too early and the fresh hub binds the fallback configuration for its whole lifetime, which is what "No renderer is registered for area Tests on hub Store" looks like from the outside.

The two predicates that decide when that wait is over — HasLoadableBuild and the settle gate behind AwaitCompilationSettled — asked node.Content is not NodeTypeDefinition, a CLR type test whose "this is not a NodeType at all" escape answers yes, go ahead. That escape also fires for a NodeType node whose content arrived un-materialized, as raw JSON rather than the CLR record — which is the normal shape for a node that just crossed a sync stream or was just created, i.e. precisely the node the installer wrote a moment earlier. In that shape a type that was still compiling answered "loadable", and the wait ended before the build existed.

The tell was visible inside a single fold: the installer read the definition with ContentAs on one line and called HasLoadableBuild on the next, so the two halves could report "still compiling" and "loadable" about the same snapshot, and the second one is what settled the wait. Both predicates now read the definition the way their consumers read it, so a gate and its consumer can no longer disagree about one node. Same defect and same fix as the instance-side settle predicate before it.

The emit canary that runs when Roslyn throws during a compile got the other half of this treatment: it now records where each of its two probe compiles died, and only reports the process-level "below Roslyn" verdict when both died in the same frame. Every NullReferenceException in .NET carries the same message, so comparing messages let two unrelated faults read as one process-wide fault — and that verdict is the one that sends an investigation after a core dump.