fix(rules): shield of faith grants its SRD deflection AC buff (+2, +1 per six caster levels, max +5) via a new BuffEffect flat scaling

data/spells/shield_of_faith.json

@@ -6,6 +6,15 @@
   "save": "will",
   "base_dc": 10,
   "cast_time": "standard",
-  "effects": [],
-  "description": "A shimmering magical field grants the target a +2 deflection bonus to AC (+1 per six caster levels, max +5) for 1 min./level. Will negates (harmless). Simplified: the engine has no self-buff encoding that preserves the pinned default-policy casting order, so no mechanical effect is applied."
+  "effects": [
+    {
+      "type": "buff",
+      "modifiers": [
+        { "target": "ac", "value": 2, "bonus_type": "deflection" }
+      ],
+      "duration_rounds": 10,
+      "scaling_flat": { "amount": 1, "per_levels": 6, "max": 3 }
+    }
+  ],
+  "description": "SRD spells/shield-of-faith.md: abjuration, level 1 (cleric/inquisitor/oracle/warpriest), range touch, duration 1 min./level, Will negates (harmless), spell resistance yes (harmless). The subject gains a +2 deflection bonus to AC, +1 per six caster levels (maximum +5 at 18th). Duration 1 min/level approximated as 10 rounds (the engine has no per-level buff duration; cf. mirror image)."
 }