test: drop an undeclared approval config key from three clean-flow fixtures

The publish-gate fixtures' "clean" approval flow carried emptyApproverPolicy,
a key the approval contract never declared; the build doors now judge that
contract whole, so the fixture was never clean.

Claude-Session: https://claude.ai/code/session_01T9u38rswFp5Rw8DswRUReJ
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/lint/src/runtime-gate.test.ts

@@ -45,7 +45,6 @@ const cleanApprovalFlow = {
       type: 'approval',
       config: {
         approvers: [{ type: 'expression', value: 'current.owner' }],
-        emptyApproverPolicy: 'reject',
       },
     },
   ],

packages/metadata-protocol/src/protocol.runtime-authoring-gate.test.ts

@@ -70,7 +70,6 @@ const validApprovalFlow = () => {
     const flow = brokenApprovalFlow();
     flow.nodes[1]!.config = {
         approvers: [{ type: 'expression', value: 'current.owner' }],
-        emptyApproverPolicy: 'reject',
     } as any;
     return flow;
 };

packages/objectql/src/plugin.authoring-channel.test.ts

@@ -274,7 +274,6 @@ describe('#6710 — the authoring channel is threaded from plugin option to prot
     const flow = brokenApprovalFlow();
     (flow.nodes[1] as any).config = {
       approvers: [{ type: 'expression', value: 'current.owner' }],
-      emptyApproverPolicy: 'reject',
     };
     const result = await (kernel.getService('protocol') as any).saveMetaItem({
       type: 'flow', name: 'leave_approval', item: flow,