Review 01 U3. EnsureFolderIsEventNotifier granted the EventNotifiers
.HistoryRead bit (and registered the event-history source) only when a
real HistorianDataSource was wired at promotion time, and EnsureVariable
composed the AccessLevels.HistoryWrite bit from whether a
HistorianDataUpdater existed at materialise time — so an assignment
after the first apply left existing folders without event history and
existing nodes refused by the SDK's HistoryUpdate admission until a full
rebuild, and a source reset to Null never took the bit back.
The two setters now re-evaluate: HistorianDataSource walks every promoted
folder (bit + source registration, both directions), HistorianDataUpdater
recomposes the AccessLevel of every historized variable (Writable read
back off the node's own CurrentWrite bit). The Host's boot ordering is no
longer load-bearing.
Tests: NodeManagerCapabilityRefreshTests (late source lights the bit on
an already-promoted folder and a reset takes it back, live-event
subscription untouched; late updater grants HistoryWrite to historized
nodes only and a reset takes it back, authored Writable preserved).
Refs #732
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT
Joseph Doherty