feat: add the-ballad-of-chalk campaign

Cloud Empress campaign for 弗莱格, a sellsword obsessed with chalk.
Ships the brief, PC sheet, state files, a starting location, and the
session 0001 log. The opening hook and hidden truth live in gm/.

campaigns/the-ballad-of-chalk/world/npcs/README.md

@@ -0,0 +1,26 @@
+# NPCs
+
+One file per NPC, named `kebab-case.md`.
+
+These files are player-facing: record what the PC has observed or been told. A
+hidden motive or an unrevealed identity belongs in `../../gm/`.
+
+```markdown
+---
+name: 
+role: 
+location: 
+status: alive | dead | missing | unknown
+disposition: friendly | neutral | hostile | unknown
+---
+
+# <name>
+
+## Description
+
+## Wants
+
+## Relationships
+
+## History
+```