feat: harden A2A funnel and paid proposal intake

apps/web/scripts/seed-bids.ts

@@ -40,11 +40,15 @@ async function main() {
       title: "Develop an ERC20 Token",
       description: "Standard ERC20",
       status: "OPEN",
-      difficulty: "MEDIUM",
+      difficulty: "COMPONENT",
       reward_amount: 1000,
       reward_currency: "USDC",
       scope_clarity_score: 1.0,
-      acceptance_criteria: { rules: [] },
+      acceptance_criteria: {
+        validation_mode: "VITEST_UNIT",
+        test_file_content: "import { describe, it, expect } from 'vitest';\nit('erc20 seed task requires tests', () => expect(true).toBe(true));",
+        rules: [{ assertion: "erc20_tests_required", expected: true }],
+      },
       required_stack: []
     }
   });