fix: serialize dispatch intent for graph runtime

contracts/work/dispatch_queue.go

@@ -10,10 +10,10 @@ const (
 )
 
 type AgentDispatchQueueItem struct {
-	DispatchID            string
-	State                 AgentDispatchQueueState
-	AvailableAtUnixMillis int64
-	Attempts              int
-	ClaimedBy             string
-	UpdatedAtUnixMillis   int64
+	DispatchID            string                  `json:"dispatch_id"`
+	State                 AgentDispatchQueueState `json:"state"`
+	AvailableAtUnixMillis int64                   `json:"available_at_unix_millis"`
+	Attempts              int                     `json:"attempts"`
+	ClaimedBy             string                  `json:"claimed_by"`
+	UpdatedAtUnixMillis   int64                   `json:"updated_at_unix_millis"`
 }

contracts/work/lease.go

@@ -50,14 +50,14 @@ type IndependentVerification struct {
 }
 
 type AgentDispatchIntent struct {
-	DispatchID             string
-	IdempotencyKey         string
-	DelegationID           DelegationID
-	RunID                  AgentRunID
-	ImplementationID       string
-	ImplementationRevision int64
-	SourceRevision         string
-	WorktreeID             string
-	VerificationPlanRef    string
-	CreatedAtUnixMillis    int64
+	DispatchID             string       `json:"dispatch_id"`
+	IdempotencyKey         string       `json:"idempotency_key"`
+	DelegationID           DelegationID `json:"delegation_id"`
+	RunID                  AgentRunID   `json:"run_id"`
+	ImplementationID       string       `json:"implementation_id"`
+	ImplementationRevision int64        `json:"implementation_revision"`
+	SourceRevision         string       `json:"source_revision"`
+	WorktreeID             string       `json:"worktree_id"`
+	VerificationPlanRef    string       `json:"verification_plan_ref"`
+	CreatedAtUnixMillis    int64        `json:"created_at_unix_millis"`
 }