Adds a "Recently Evergreened" section to /garden/ showing posts that
reached evergreen status within the last 90 days, with a dedicated
green celebration card style.
- New `recentEvergreens` Eleventy collection (evergreeSince within 90d)
- garden.njk: conditional celebration section above the stage groups
- tailwind.css: .garden-evergreen-celebration card (evergreen palette)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Inspired by Maggie Appleton / Andy Matuschak — evergreen notes are
mature and reasonably complete but still alive and growing.
Sits between cultivate and question in the stage order.
Rendered in teal to distinguish from the green seedling/growing stages.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
