WHY IT MATTERS
When every item has identical visual weight, an archive cannot show what changed the field. Milestones provide the spine for an AI evolution timeline.
WHAT CHANGED
Entries now carry an importance score from News to Milestone and can link backward and forward through an evolving timeline.
QI'S TAKE
The timeline is the long-term product. The feed is only how material enters it.
SOURCE NOTE
For a milestone, the useful unit is not only a summary. It is an original artifact, the surrounding announcement, an explanation of what changed afterwards, and a personal judgment that can be revised over time.