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/Types.hs

@@ -112,6 +112,10 @@ data AgentProposalsController
     | RejectProposalAction    { agentProposalId :: !(Id AgentProposal) }
     deriving (Eq, Show, Data)
 
+data ApiInteractionEventsController
+    = CreateApiInteractionEventAction
+    deriving (Eq, Show, Data)
+
 data EnvelopeEmissionContractsController
     = EnvelopeEmissionContractsAction
     | ShowEnvelopeEmissionContractAction { envelopeEmissionContractId :: !(Id EnvelopeEmissionContract) }