Merge origin/main into multi-port-service

Resolve conflicts:
- deployment_context.py: Keep single modify_yaml method from main
- fixturenet-optimism/commands.py: Use modify_yaml helper from main
- deployment_create.py: Keep helm-chart, network-dir, initial-peers options
- deploy_webapp.py: Update create_operation call signature

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

stack_orchestrator/data/stacks/fixturenet-optimism/deploy/commands.py

@@ -14,7 +14,6 @@
 # along with this program.  If not, see <http:#www.gnu.org/licenses/>.
 
 from stack_orchestrator.deploy.deployment_context import DeploymentContext
-from ruamel.yaml import YAML
 
 
 def create(context: DeploymentContext, extra_args):
@@ -28,17 +27,12 @@ def create(context: DeploymentContext, extra_args):
         "compose", "docker-compose-fixturenet-eth.yml"
     )
 
-    with open(fixturenet_eth_compose_file, "r") as yaml_file:
-        yaml = YAML()
-        yaml_data = yaml.load(yaml_file)
-
     new_script = "../config/fixturenet-optimism/run-geth.sh:/opt/testnet/run.sh"
 
-    if new_script not in yaml_data["services"]["fixturenet-eth-geth-1"]["volumes"]:
-        yaml_data["services"]["fixturenet-eth-geth-1"]["volumes"].append(new_script)
+    def add_geth_volume(yaml_data):
+        if new_script not in yaml_data["services"]["fixturenet-eth-geth-1"]["volumes"]:
+            yaml_data["services"]["fixturenet-eth-geth-1"]["volumes"].append(new_script)
 
-    with open(fixturenet_eth_compose_file, "w") as yaml_file:
-        yaml = YAML()
-        yaml.dump(yaml_data, yaml_file)
+    context.modify_yaml(fixturenet_eth_compose_file, add_geth_volume)
 
     return None