add integrate task

Taskfile.yaml

@@ -1,6 +1,22 @@
 # https://taskfile.dev
-version: '3'
+version: "3"
+
+vars:
+  PARENT_BRANCH: main
 
 tasks:
   test: vitest run src
   test:dev: vitest src
+
+  integrate:
+    deps: [test]
+    preconditions:
+      - sh: git is-clean
+        msg: checkout not clean
+      - sh: git diff-ls  {{.PARENT_BRANCH}} | grep test
+        msg: no tests were added
+      - sh: git diff-ls  {{.PARENT_BRANCH}} | grep CHANGELOG.yml
+        msg: no changelog entry detected
+    cmds:
+      - git checkout {{.PARENT_BRANCH}}
+      - git weld -