fix: Pin OpenZeppelin to v4.9.6 and add mock registrations for Phase 4 tests

- Pin OpenZeppelin to v4.9.6 to match contract import structure
- Add mock registrations for PerformanceVerifier, AgentBounty, AgentStaking
- PerformanceAggregator.initialize() requires these contracts in registry

.gitea/workflows/smart-contract-tests.yml

@@ -134,8 +134,8 @@ jobs:
 
           echo "=== Running Foundry Tests ==="
           
-          # Install OpenZeppelin dependencies
-          forge install OpenZeppelin/openzeppelin-contracts
+          # Install OpenZeppelin dependencies (v4.x for compatibility with existing imports)
+          forge install OpenZeppelin/openzeppelin-contracts@v4.9.6
           echo "✅ OpenZeppelin dependencies installed"
           
           # Build contracts

contracts/test/Phase4ModularContracts.test.js

@@ -83,6 +83,20 @@ describe("Phase 4 Modular Smart Contracts", function () {
     );
     // PerformanceAggregator registers itself during initialize(), so don't register it here
 
+    // Register mock contracts that PerformanceAggregator.initialize() requires
+    await contractRegistry.registerContract(
+      ethers.keccak256(ethers.toUtf8Bytes("PerformanceVerifier")),
+      user1.address
+    );
+    await contractRegistry.registerContract(
+      ethers.keccak256(ethers.toUtf8Bytes("AgentBounty")),
+      user2.address
+    );
+    await contractRegistry.registerContract(
+      ethers.keccak256(ethers.toUtf8Bytes("AgentStaking")),
+      deployer.address
+    );
+
     // Initialize all contracts (after registration)
     await treasuryManager.initialize(await contractRegistry.getAddress());
     await rewardDistributor.initialize(await contractRegistry.getAddress());