ci: add yamllint

Author: pythoninthegrass

.tool-versions

@@ -1,6 +1,7 @@
-deno 2.5.1
-prek   0.3.2
-python 3.11.13
-ruby   3.4.5
-ruff   0.12.11
-uv     0.8.8
+deno     2.5.1
+prek     0.3.2
+python   3.11.13
+ruby     3.4.5
+ruff     0.12.11
+uv       0.8.8
+yamllint 1.38.0

.yamllint

@@ -0,0 +1,17 @@
+---
+extends: default
+
+ignore:
+  - .venv/
+  - .serena/
+  - .github/
+
+rules:
+  document-start: disable
+  line-length:
+    max: 150
+  indentation:
+    spaces: 2
+    indent-sequences: true
+  truthy:
+    check-keys: false