Add writing ink and baseline link panel preparation

docs/WRITING_DATA.md

@@ -64,3 +64,20 @@ identifier. Built-in pages reproduce Mystcraft Legacy's four-word poem
 composition from its page background and symbol-component sheet. Data-pack
 symbols without a bundled resource-pack model use the legacy question-mark
 fallback while keeping their real identifier and display metadata.
+
+## Ink and baseline link panels
+
+An Ink Vial is crafted from two black dye, a glass bottle, and a water bucket.
+The bucket remains after crafting. Each vial holds 16 ink units, stored in a
+persistent, network-synchronized component; only vials with identical remaining
+ink stack together. When depleted, a vial returns a glass bottle that can be
+used to craft another. The animated item texture comes from Mystcraft Legacy.
+
+The server config sets ink costs independently for symbol copying (default one
+unit) and baseline link-panel preparation (default two units). To prepare a
+panel, hold a blank Page in one hand and use an Ink Vial in the other. The
+server checks the held items, blank state, and sufficient ink before consuming
+anything. A stack of blank Pages yields exactly one Link Panel Page per use;
+if the inventory is full, the result is dropped instead of deleted. Symbol
+copying will be implemented by the Writing Desk. Link-property modifiers are
+deferred beyond this baseline flow.