chore: remove the unused operator Makefile and devenv module

AGENTS.md

@@ -40,7 +40,6 @@ task documentation:ci       # Run documentation CI
 task documentation:spellcheck  # Run spellcheck
 
 # Integration testing
-task integration:devenv     # Create ephemeral development environment
 task integration:e2e        # Run e2e tests (requires KIND_CLUSTER_NAME)
 
 # Cleanup
@@ -70,6 +69,14 @@ task core:go-test
 cd operator && go test ./... -v
 ```
 
+The operator controller tests use envtest. Running them directly (outside
+`task operator:go-test`) requires the envtest binaries in `operator/bin/k8s`:
+
+```bash
+go install sigs.k8s.io/controller-runtime/tools/setup-envtest@latest
+cd operator && setup-envtest use --bin-dir bin
+```
+
 #### Running a Single Test
 ```bash
 # Core module

Taskfile.yml

@@ -1593,16 +1593,6 @@ tasks:
     sources:
       - integration/tests/machinery/**/*.go
 
-  integration:devenv:
-    desc: Create and connect to an ephemeral development environment
-    interactive: true
-    deps:
-      - core:containerize-snapshot
-      - operator:containerize-snapshot
-      - operator:helm-chart
-    cmds:
-      - dagger call -m integration/dagger/devenv kubernetes --source .
-
   integration:deploy-to-kind:
     desc: Deploy the operator on a kind cluster generated by the CNPG hack setup script
     summary: |

documentation/web/docs/developer/developers.mdx

@@ -8,32 +8,6 @@ sidebar_position: 1
 
 * A [dagger](https://dagger.io/) installation
 
-## How to get an ephemeral development environment
-
-For a quick and convenient development experience, you can create an ephemeral
-development environment using the `integration:devenv` task from the Taskfile:
-
-```sh
-task integration:devenv
-```
-
-This command creates and connects you to an ephemeral development environment
-with all the necessary components pre-configured, making it easier to test and
-develop Klio features without affecting your local setup.
-
-Here are the instructions to deploy the Klio server and the CNPG cluster with
-the Klio plugin, using manifests under `operator/config/samples`.
-The following commands are executed inside the dagger container created from
-the previous step:
-
-```sh
-# Deploy the Klio server with the related resources
-dagger /apps $ kubectl apply -f ../operator/config/samples/klio_v1alpha1_server.yaml
-
-# Deploy the CNPG Cluster with a patch for the plugin and the related PluginConfiguration CR
-dagger /apps $ kubectl apply -f ../operator/config/samples/cluster-example-plugin.yaml
-```
-
 ## How to test Klio in a kind cluster during development
 
 During the development phase, it is recommended to test any changes in a test