chore(ci): drop yamllint workflow

.github/workflows/codequality-yamllint.yaml

@@ -1,19 +0,0 @@
----
-name: Code Quality - yamllint
-
-'on':
-  pull_request:
-    branches:
-      - main
-
-permissions:
-  contents: read
-
-jobs:
-  lint:
-    name: Linters
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v6
-      - run: yamllint --strict -- $(git ls-files '*.yaml' '*.yml')

.yamllint

@@ -1,11 +0,0 @@
----
-extends: default
-
-rules:
-  comments-indentation: disable
-  indentation:
-    spaces: 2
-    indent-sequences: true
-  line-length:
-    max: 160
-    level: warning

AGENTS.md

@@ -29,7 +29,6 @@ For detailed information about testing boilerplates in a production-like environ
 
 Should **always** happen before pushing anything to the repository.
 
-- Use `yamllint` for YAML files
 - Use `ruff` for Python code:
   - `ruff check --fix .` - Check and auto-fix linting errors (including unused imports)
   - `ruff format .` - Format code according to style guidelines