Status effects expire on their data duration; loot rolls never throw

A status effect added without an explicit duration started with no remaining
turns and the countdown skipped it, so it never expired. OnTurnEnd counted
down a second time, expired unlimited effects after one turn and removed
expired stacks by id; it is now a pure hook. The victory screen rolls loot
through LootEntry.Roll, so a loot table with MinCount > MaxCount no longer
throws half-way through the battle end, and its success-path diagnostics are
no longer logged as errors. Mod unit tests for the status effect lifetime.

manifest.json

@@ -8,5 +8,6 @@
   "sources": [
     "src/**/*.cs"
   ],
+  "test_sources": ["tests/*.cs"],
   "depends": [ "characters_base>=1", "ui_base>=1", "items_base>=1", "quests_base>=1", "time_base>=1" ]
 }