feat(spells): allow spells to ignore spell resistance

SpellSpec gains spell_resistance: bool = True (JSON 'spell_resistance'). When false, _spell_delivery_blocked skips the targeted SR check and _apply_area_effect skips the per-creature SR check (threaded through the effect chain). Verified each imported spell against the local KB and set false on the 28 whose SRD block says 'Spell Resistance: no' (Acid Arrow, Flurry of Snowballs, Web, Darkness, Sanctuary, the Protection from X spells, etc.). Added no-SR targeted/area tests and a high-SR control in test_spell_resistance.py, and the README.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

data/spells/protection_from_law.json

@@ -6,6 +6,7 @@
   "save": "will",
   "base_dc": 10,
   "cast_time": "standard",
+  "spell_resistance": false,
   "effects": [],
   "description": "A barrier wards the subject from lawful creatures for 1 min/level: +2 deflection bonus to AC and +2 resistance bonus on saves against attacks and effects created by lawful creatures, plus renewed saves against mental control by lawful creatures. Will negates (harmless). The engine has no alignment system, so alignment-restricted bonuses cannot be modeled and the spell has no mechanical effects here."
 }