Update CI workflows to use Noir 1.0.0-beta.18

- solidity-example.yml: Update toolchain from 1.0.0-beta.15 to 1.0.0-beta.18
- solidity-example.yml: Replace --oracle_hash keccak with --verifier_target evm
- web-starter-playwright.yml: Update toolchain from 1.0.0-beta.15 to 1.0.0-beta.18

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: critesjosh

.github/workflows/solidity-example.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Install Nargo
         uses: noir-lang/[email protected]
         with:
-          toolchain: 1.0.0-beta.15
+          toolchain: 1.0.0-beta.18
 
       - name: Run Noir unit tests
         working-directory: solidity-example/circuits
@@ -63,7 +63,7 @@ jobs:
         working-directory: solidity-example/circuits
         run: |
           nargo execute
-          bb prove -b ./target/noir_solidity.json -w target/noir_solidity.gz -o ./target --oracle_hash keccak
+          bb prove -b ./target/noir_solidity.json -w target/noir_solidity.gz -o ./target --verifier_target evm
           cd ..
           (cd contract && forge test --optimize --optimizer-runs 5000 --gas-report -vvv)
 

.github/workflows/web-starter-playwright.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Install Nargo
         uses: noir-lang/[email protected]
         with:
-          toolchain: 1.0.0-beta.15
+          toolchain: 1.0.0-beta.18
 
       - name: Install bb
         run: |