Complete descriptive book return links

docs/PORTING.md

@@ -10,7 +10,7 @@ split into independently testable milestones.
 1. **Bootstrap** — NeoForge 1.21.1 build, mod metadata, item registration, and
    CI. **Complete.**
 2. **Books and linking** — descriptive/linking book data components, lectern-like
-   interaction, safe teleportation, and return links. **In progress.**
+   interaction, safe teleportation, and return links. **Complete.**
 3. **Ages** — dimension definitions backed by data packs, deterministic seeds,
    lifecycle management, and persistence.
 4. **Writing system** — pages, symbols, notebooks, desks, and book assembly.
@@ -42,10 +42,10 @@ the symbol grammar is introduced.
 - [x] Persistent, network-synchronized link-target data component.
 - [x] Linking Book binding with dimension, block position, yaw, and pitch.
 - [x] Server-authoritative cross-dimension travel with world-border, collision,
-  fluid, and floor checks.
+  and fluid checks.
 - [x] Nearby landing search and clear failure messages.
 - [x] Descriptive Book identity and Age reference components.
-- [ ] Return-link creation as part of Descriptive Book travel.
+- [x] Temporary vanilla-dimension Descriptive Book travel with return-link creation.
 - [x] Lectern-to-Book-Stand conversion, displayed book, activation, removal,
   persistence, and drops.
 - [x] Book-screen foundation with server-authoritative naming, binding, and
@@ -145,6 +145,10 @@ unchanged.
 Version 0.1.21 treats air and leaf blocks as passable linking destinations;
 links no longer require a solid floor beneath the player.
 
+Version 0.2.0 completes Milestone 2. Until Milestone 3 provides generated Age
+dimensions, Descriptive Book UUIDs deterministically resolve to vanilla
+dimensions and create a bound Return Link to the source on successful travel.
+
 The preview code is separated behind a renderer interface and uses an isolated
 Ponder level populated from server-authoritative destination snapshots.