content(creation): the eleven origin fragments

race.fragment + calling.fragment compose the DM origin panel on the creation
screen. Authored prose, not stubs — this is the first sentence the player reads.
Parity-tested: a missing or empty fragment fails the suite.

content/world/races/human.json

@@ -1 +1 @@
-{ "id": "human", "name": "Human", "blurb": "Short-lived, adaptable, everywhere. The Margreave is mostly yours, for whatever that has been worth." }
+{ "id": "human", "name": "Human", "blurb": "Short-lived, adaptable, everywhere. The Margreave is mostly yours, for whatever that has been worth.", "fragment": "You were born in one of the Margreave's thousand small towns, and it let you go without asking where." }