Move linter settings from the broken v1-style top-level linters-settings
key to linters.settings so golangci-lint >= v2 actually applies the
thresholds, and drop issues.exclude-use-default, which no longer exists
in the v2 schema. Add a comment documenting the v2 layout requirement.
Record the change in TODO.md Completed Steps.
- Add .golangci.yml from upaas as authoritative copy in this repo
- Update REPO_POLICIES.md to reference .golangci.yml by URL
- Add fetch URLs for all template files in both checklists:
.gitignore, .editorconfig, Makefile, .prettierrc, .prettierignore,
REPO_POLICIES.md, .golangci.yml, check.yml
