refactor: modernise to Go 1.26 — iterators, slices, maps, strings
- Add ParsePlaybookIter, ParseTasksIter, GetHostsIter, AllHostsIter (ansible)
- Add ListTemplatesIter (container), TargetsIter (build), LanguagesIter (sdk)
- Replace sort.Slice with slices.SortFunc across cmd/dev, cmd/qa, cmd/monitor, cmd/setup
- Replace manual map-key-sort with slices.Sorted(maps.Keys(...))
- Replace strings.Split with strings.SplitSeq where result is iterated (devkit)
- Replace range-over-int in complexity_test, ansible/modules, devops
- Remove redundant manual min() in favour of built-in
- 22 files, all tests pass
Co-Authored-By: Gemini <noreply@google.com>
Co-Authored-By: Virgil <virgil@lethean.io>
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