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/state/clocks.md

@@ -0,0 +1,8 @@
+# Clocks
+
+Ticking pressures. Fill a segment whenever the fiction advances the clock.
+
+| Clock | Segments | Filled | Notes |
+|-------|----------|--------|-------|
+| 巨蝉苏醒 | 6 | 0 | 夏天一到，巨蝉便从地下醒来。每过一段时日填一格。 |
+| 村庄的真相 | 4 | 0 | 每当弗莱格逼近孩子谎言的破绽，填一格；填满则真相浮出。 |