One stream for every change.

What "governed" means here

Status gate: only events already marked reviewed or published in the intelligence pipeline appear; nothing in a draft or pending-review state reaches this feed.

Evidence, not narrative: every event links back to its source artifact and content hash where one exists, so a headline can be checked against the underlying filing or record rather than taken as-is.

Severity: percentile migrations are marked material at a 30-point-or-larger swing and watch otherwise; every other event kind carries info — severity here is a triage label, not a risk rating.