Add writing ink and baseline link panel preparation

README.md

@@ -13,8 +13,13 @@ have not been ported yet.
 
 Milestone 4 now includes stackable blank Pages plus server-created symbol,
 unresolved-symbol, and baseline link-panel states. Page visuals follow the
-legacy runtime-composition rules; written-page creation will become available
-through the Writing Desk work that follows.
+legacy runtime-composition rules. Craft an Ink Vial from two black dye, a glass
+bottle, and a water bucket; the bucket is returned. Hold a blank Page in one
+hand and use the Ink Vial in the other to prepare a baseline Link Panel Page.
+Each vial holds 16 ink units, and the default link-panel cost is two units.
+The spent vial returns a glass bottle. Server owners can adjust the symbol-copy
+and link-panel costs in the `writing` section of `rivencraft-server.toml`.
+Symbol-page transcription will become available through the Writing Desk.
 
 ## Linking Book