feat(P6/T02-T03): EnvelopeEmissionContract and InteractionReportingContract

T02: EnvelopeEmissionContractsController (index+show, read-only); widgetEnvelope
helper validates against contract v1.0 required attributes with inline warning
on missing view-context; adapterStatusBadge helper added to Application.Helper.View.

T03: InteractionReportingContractsController (index+show, read-only); API endpoint
POST /api/v1/interaction-events with bearer token auth against hub.api_key,
contract v1.0 field validation, and 201/422/401 responses.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Web/FrontController.hs

@@ -17,6 +17,7 @@ import Web.Controller.Requirements ()
 import Web.Controller.DecisionRecords ()
 import Web.Controller.DeploymentRecords ()
 import Web.Controller.AgentProposals ()
+import Web.Controller.ApiInteractionEvents ()
 import Web.Controller.EnvelopeEmissionContracts ()
 import Web.Controller.InteractionReportingContracts ()
 import Web.Controller.WidgetAdapterSpecs ()
@@ -35,6 +36,7 @@ instance FrontController WebApplication where
         , parseRoute @DecisionRecordsController
         , parseRoute @DeploymentRecordsController
         , parseRoute @AgentProposalsController
+        , parseRoute @ApiInteractionEventsController
         , parseRoute @EnvelopeEmissionContractsController
         , parseRoute @InteractionReportingContractsController
         , parseRoute @WidgetAdapterSpecsController