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/characters/_template.md

@@ -0,0 +1,18 @@
+---
+name: 
+game: 
+stats: {}
+tracks: {}
+conditions: []
+inventory: []
+---
+
+# 
+
+## Description
+
+## Background
+
+## Relationships
+
+## Notes