Add WaitForAttribute(attributeName, targetValue, timeout, cancellationToken)
to InboundScriptHost.RouteTarget and SandboxInboundScriptHost.RouteTarget,
mirroring the shipped runtime signature in RouteHelper. Eliminates the false
CS error the editor raised against valid Route.To("X").WaitForAttribute(...)
calls in inbound API method scripts. Test asserts the call diagnoses clean
under ScriptKind.InboundApi.
Resolve all 622 issues flagged by the enhanced CommentChecker: add missing
<returns> tags (incl. the standard phrasing on non-generic Task methods),
add missing <summary> tags, and replace misused/redundant <inheritdoc/> on
members that override or implement nothing with real documentation.
Documentation-only — no behavior change; solution builds clean.
Joseph Doherty