Changelog: add entries for 2026-05-28 through 2026-06-09, regenerate
the 2026-05-26/27 entries to cover their full days, and add the
missing 2026-05-27 navigation entry.
Product docs: scope workflow templating docs to prompt + goal (#474),
document the server-managed environments directory and seeded
built-ins (#446/#453), add a new Automations page, and list the
Automations/Environments/Variables endpoints in the API reference nav.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
