feat(director): add authored camera directions and anchors

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+- Director version 4 adds named camera anchors and explicit pose-to-pose moves
+  with shared playback/seek interpolation, easing and holds. Navigation and
+  manual input cancel authored motion; older scene files retain existing flights.
+
+
 - Director validates bounded version-3 scene files before replacing a project,
   preserves unreadable browser saves, migrates legacy bloom once and preserves
   zero-pitch/low-altitude camera and scope/detection edits. Project normalization has a separate owner.