fix(rules): harmless spells on willing targets forgo the save roll - SpellSpec gains a data-driven 'harmless' flag set on the 29 SRD '(harmless)' spells (verified one by one against the KB); a same-side/self target consumes NO save die (SRD saving-throw.md: '(harmless) ... can attempt a saving throw if it desires' + 'Voluntarily Giving up a Saving Throw'), while hostile targets and undead receiving a cure (harmful to them, Will half for undead damage) keep the roll; snapshot spell summaries expose 'harmless'; golden transcript unchanged (no harmless-save cast in it); +8 tests, 3 fixtures re-pinned for the removed die

data/spells/bears_endurance.json

@@ -4,6 +4,7 @@
   "school": "transmutation",
   "range": "touch",
   "save": "will",
+  "harmless": true,
   "base_dc": 10,
   "cast_time": "standard",
   "effects": [