feat: condition modifiers applied to ALL roll paths (v1.6.0)

Every dice roll now checks active conditions before building its pool:
- _onRoll (legacy .rollable attribute + skill paths)
- _onRollEbbFormula (Empathy + Ebb pool)
- _rollInitiative (bonus-successes roll pool + chat card label)
- _onVitalSave (Health/Resolve saves, with auto-fail at 0 dice)

Condition penalty is shown in the formula string on every chat card.
Panicking (-2 all) and Shaken (-1 all) now silently reduce every roll
until the GM clears the condition.

system.json

@@ -2,7 +2,7 @@
   "id": "zero-engine",
   "title": "Zero Engine (SLA Industries)",
   "description": "A basic game system for SLA Industries using the Zero Engine rules.",
-  "version": "1.5.9",
+  "version": "1.6.0",
   "compatibility": {
     "minimum": 13,
     "verified": "14.359"