feat: migrate workflows to kcl-ci standard

- Add .forgejo/kcl-ci/ with kcl.mod, main.k, Taskfile.yaml
- claude.yml: use claude.k module (fixes #comment YAML validation error,
  removes duplicate pull_request_comment trigger)
- ci.yml: add paths-ignore for kcl-ci paths, named jobs for check constants
- test-action.yml: regenerated from KCL (functionally identical)
- upstream-sync.yml: regenerated from KCL (functionally identical)
- kcl-ci-build.yml: new auto-regeneration workflow (waits for CI checks)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.forgejo/kcl-ci/Taskfile.yaml

@@ -0,0 +1,16 @@
+---
+version: "3"
+
+vars:
+  TASK_REPO_LOCAL: ~/stuff/gitrepos/wxs/task
+  TASK_REPO_BASE: git.wxs.ro/wxs/task/raw/branch/main
+
+includes:
+  kcl:
+    taskfile: "{{if .CI}}https://token:{{.READ_REPO_TOKEN}}@{{.TASK_REPO_BASE}}/kcl-ci-consumer.yml{{else}}{{.TASK_REPO_LOCAL}}/kcl-ci-consumer.yml{{end}}"
+
+tasks:
+  default:
+    desc: Show available tasks
+    cmds:
+      - task --list