Home Assistant platform changes to act on

Moved from policies/hass-alignment.md (policy review, hq-private#110): these are work to do, not policy. The ecosystem review adds to this list and the alignment review spreads the fixes; remove an item once every repo has caught up.

• Support the HA change to the new Contributors site by updating URLs that point to the old developer or data sites
• HACS moving into Home Assistant as Marketplace (project: projects/ha_marketplace.md)
  • https://github.com/home-assistant/home-assistant.io/blob/7896394058b9b9576692cf990cbb36dcfbef1c8a/source/_integrations/marketplace.markdown
• homeassistant-stubs is deprecated, since HA now ships its own types (still used by supernotify, autoarm and remote_logger in November 2026)
• pytest-homeassistant-custom-component is deprecated in favour of HA’s own pytest-homeassistant from HA 2026.11 (still used by supernotify and remote_logger in November 2026)