fix: update testnet compatibility test and bust cache on pinned artifact changes (#22429)

## Summary

Two changes to fix the testnet compatibility test breakage on v4-next:

**1. Fix test to match actual testnet deployment**
- Testnet was deployed without SponsoredFPC — remove it from genesis
computation
- Update expected genesis archive root to `0x15684c8c...` (verified
against on-chain testnet L1 rollup at `0xf6d0...c1` on Sepolia)
- All 3 values verified on-chain: VK tree root, protocol contracts hash,
genesis archive root

**2. Bust test cache when pinned artifacts change**
- Mix hashes of `pinned-protocol-contracts.tar.gz`,
`pinned-build.tar.gz` (VKs), and
`mock-protocol-circuits/pinned-build.tar.gz` into the compatibility test
cache prefix
- This ensures the test re-runs whenever pinned artifacts are updated,
preventing the CI cache from masking mismatches

## On-chain verification

```
$ cast call 0xf6d0...c1 "archiveAt(uint256)(bytes32)" 0 --rpc-url sepolia
0x15684c8c3d2106918d3860f777e50555b7166adff47df13cc652e2e5a50bf5c7  # genesis archive root

$ cast storage 0xf6d0...c1 <config.vkTreeRoot slot> --rpc-url sepolia
0x1dd2644a17d1ddd8831287a78c5a1033b7ae35cdf2a3db833608856c062fc2ba  # VK tree root

$ cast storage 0xf6d0...c1 <config.protocolContractsHash slot> --rpc-url sepolia
0x2672340d9a0107a7b81e6d10d25b854debe613f3272e8738e8df0ca2ff297141  # protocol contracts hash
```

Author: Thunkar

yarn-project/aztec/src/testnet_compatibility.test.ts

@@ -1,6 +1,4 @@
-import type { InitialAccountData } from '@aztec/accounts/testing';
 import { Fr } from '@aztec/aztec.js/fields';
-import { getSponsoredFPCAddress } from '@aztec/cli/cli-utils';
 import { getVKTreeRoot } from '@aztec/noir-protocol-circuits-types/vk-tree';
 import { protocolContractsHash } from '@aztec/protocol-contracts';
 import { getGenesisValues } from '@aztec/world-state/testing';
@@ -20,13 +18,11 @@ describe('Testnet compatibility', () => {
     );
   });
   it('has expected Genesis tree roots', async () => {
-    const initialAccounts: InitialAccountData[] = [];
-    const sponsoredFPCAddress = await getSponsoredFPCAddress();
-    const initialFundedAccounts = initialAccounts.map(a => a.address).concat(sponsoredFPCAddress);
-    const { genesisArchiveRoot } = await getGenesisValues(initialFundedAccounts);
+    // Testnet was deployed without SponsoredFPC or any initial funded accounts
+    const { genesisArchiveRoot } = await getGenesisValues([]);
 
     expect(genesisArchiveRoot).toEqual(
-      Fr.fromHexString('0x2727683df35594b1f073a681532520056ca8a775398c8b5a94574c67ef1ce6de'),
+      Fr.fromHexString('0x15684c8c3d2106918d3860f777e50555b7166adff47df13cc652e2e5a50bf5c7'),
     );
   });
 });

yarn-project/bootstrap.sh

@@ -225,8 +225,16 @@ function test_cmds {
   aztec/bootstrap.sh test_cmds
 
   if [[ "${TARGET_BRANCH:-}" =~ ^(v[0-9]+(-next)?|backport-to-v[0-9]+-(staging|next))$ ]]; then
-    echo "$hash yarn-project/scripts/run_test.sh aztec/src/testnet_compatibility.test.ts"
-    echo "$hash yarn-project/scripts/run_test.sh aztec/src/mainnet_compatibility.test.ts"
+    # Mix in hashes of pinned artifact archives so the test cache busts when they change.
+    # These archives contain protocol contracts, VKs, and circuit artifacts that determine
+    # the on-chain genesis state the compatibility tests verify against.
+    local compat_hash=$(hash_str $hash \
+      $(cache_content_hash \
+        "^noir-projects/noir-contracts/pinned-protocol-contracts.tar.gz" \
+        "^noir-projects/noir-protocol-circuits/pinned-build.tar.gz" \
+        "^noir-projects/mock-protocol-circuits/pinned-build.tar.gz"))
+    echo "$compat_hash yarn-project/scripts/run_test.sh aztec/src/testnet_compatibility.test.ts"
+    echo "$compat_hash yarn-project/scripts/run_test.sh aztec/src/mainnet_compatibility.test.ts"
   fi
 }