Add Milestone 7 regression and documentation review (#83)

docs/AGES.md

@@ -11,7 +11,7 @@ suffixes such as `_2` and `_3`.
 
 The selected terrain profile, biome distribution, lighting, weather, celestial
 period, celestial angle, and phase are deterministic and become part of the
-saved definition. A five-by-five cobblestone platform with clear headroom is
+saved definition. A five-by-five non-dropping Crystal Platform with clear headroom is
 prepared at a safe arrival point. The completed book and every copy carrying
 the same UUID resolve to that definition.
 
@@ -42,10 +42,11 @@ on demand when an administrator previously unloaded it. Unloading retains the
 definition and world folder, so existing books continue to reference the same
 Age and later reload the same terrain.
 
-Rivencraft does not automatically delete Ages. Safe permanent deletion needs a
-complete reference index for books in inventories, containers, Book Stands,
-and unloaded chunks. Until that exists, retaining the definition prevents an
-administrator action from silently orphaning books.
+Rivencraft does not automatically delete Ages. The operator-only creative Link
+Modifier can deliberately retire an unoccupied Age: it unloads the dimension,
+moves its data to a sibling `<world>-retired-ages/<uuid>` archive, and records
+the UUID as dead so existing books cannot silently regenerate it. Back up the
+whole world first.
 
 Destination-preview chunk loaders are temporary. Rivencraft releases them when
 the book closes, the player travels, the player disconnects, the destination
@@ -101,8 +102,8 @@ Use this sequence when a book cannot load an existing Age:
    matching dimension data and authoritative world saved data from the same
    backup generation. Do not combine them from different backups.
 
-There is intentionally no delete command in Milestone 3. Do not manually
-delete an Age definition or rename its dimension folder: books may exist in
-inventories, containers, Book Stands, or unloaded chunks, and would be
-orphaned. `/rivencraft age unload` is the supported reversible maintenance
-operation.
+Do not manually delete an Age definition or rename its dimension folder:
+books may exist in inventories, containers, Book Stands, or unloaded chunks.
+`/rivencraft age unload` remains the reversible maintenance operation. The
+Link Modifier's retirement control is not reversible through a book UI;
+recover its archived data and registry together from a full-world backup.