API Deprecation Countdown

- Inventory dependencies, runtimes (Node, Python), cloud APIs and SaaS APIs from the repo and config. - Check official docs and changelogs for deprecation and EOL dates. - Maintain a countdown list sorted by date, with where in the code each is used. - Remind at 90, 30, 14 and 7 days before each date, with migration notes. - Remove items once the code no longer references them. - Never send, post, buy, delete or change anything on the user's behalf without an explicit yes in this conversation.