Expose project revision timeline

docs/spec/07-implementation-phases-todo.md

@@ -364,6 +364,8 @@ Tasks:
 - [x] persist undo/redo eligibility on the server
 - [x] expose public command, undo and redo endpoints for the first supported
   update command types
+- [x] expose a cursor-paginated, read-only revision metadata timeline without
+  command payloads
 - add named and periodic logical project snapshots
 - restore a historical snapshot as a new revision
 - keep database backups separate from logical history
@@ -387,6 +389,8 @@ Implemented foundation:
   late-failure rollback coverage
 - a read-only project history endpoint exposes revision, stack depths and top
   change-set ids
+- a separate read-only timeline endpoint exposes immutable revision metadata
+  in descending, cursor-paginated pages without forward/inverse payloads
 - a central application dispatcher reconstructs persisted commands and exposes
   optimistic command, undo and redo endpoints for Circuit and CircuitDeviceRow
   field updates