v0.10.6 — compatibility values as strings

compatibility.minimum was the integer 13. Foundry's package schema uses string
fields, so a manifest install can fail validation on it. It never surfaced
locally because the system was installed by copying files, not by manifest.

Found while fixing the same class of bug in the DELVE module, whose relationship
entry used type: "requires" — the relationship kind — where the schema wants a
package type. That one produced a hard install error on a remote server.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

system.json

@@ -2,9 +2,9 @@
   "id": "vanity",
   "title": "VANITY — the Vanity Role-Playing Game",
   "description": "A generic d6 RPG where ego is a resource and the universe keeps score. Pool = Attribute + Knack + situation; 5–6 = a Success; two or more 1s bank a Bane of Karma unless you burn a Success to cancel one (Draft 14). No hit points — Grit. Vanity, Karma and Glory drive play. Includes the full Draft 13 rulebook, all spells and gear, the starter bestiary, a 100-item Treasures & Relics library, twenty ready-to-play characters (each with cameo art, token and backstory), ten animal companions with the d10 Bond table and the one-shot adventure The Vain Crown.",
-  "version": "0.10.5",
+  "version": "0.10.6",
   "compatibility": {
-    "minimum": 13,
+    "minimum": "13",
     "verified": "14.365"
   },
   "authors": [