Telegraf Controller missing llms.txt and llms_full.txt

Controller has Markdown twins (verified: /telegraf/controller/index.md serves text/markdown), but llms.txt doesn't mention the product at all, and there's no llms-full.txt corpus for it. An llms.txt-first agent — the doc's own recommended consumption path — cannot find this page.
The llms.txt exclusion is explicit and documented in `scripts/lib/corpus-paths.js:19` — products without content_path in products.yml (named:
telegraf_controller) are skipped, so there's no section entry and no llms-full.txt corpus.