feat(combat): add concealment miss chance, sneak attack, and Precise Shot

src/pf1e_simulator/conditions.py

@@ -37,6 +37,7 @@ class Condition:
     cant_aoo: bool = False
     must_flee: bool = False
     speed_mult: float = 1.0
+    miss_chance: int = 0
 
 
 # ── Fear conditions ──────────────────────────────────────────────────────────
@@ -253,6 +254,19 @@ STAGGERED = Condition(
     name="staggered",
 )
 
+# ── Concealment conditions ───────────────────────────────────────────────────
+# Blurred (blur spell): concealment — 20% miss chance on attacks (CRB)
+BLURRED = Condition(
+    name="blurred",
+    miss_chance=20,
+)
+
+# Displaced (displacement spell): total concealment — 50% miss chance (CRB)
+DISPLACED = Condition(
+    name="displaced",
+    miss_chance=50,
+)
+
 # ── Registry ─────────────────────────────────────────────────────────────────
 CONDITIONS_BY_NAME: dict[str, Condition] = {
     c.name: c
@@ -260,6 +274,6 @@ CONDITIONS_BY_NAME: dict[str, Condition] = {
         SHAKEN, SICKENED, FATIGUED, EXHAUSTED, ENTANGLED, DAZZLED,
         BLINDED, DEAFENED, FLAT_FOOTED, PRONE, STUNNED, PARALYZED,
         NAUSEATED, DAZED, STAGGERED, FRIGHTENED, PANICKED, COWERING,
-        ASLEEP, GRAPPLED, PINNED,
+        ASLEEP, GRAPPLED, PINNED, BLURRED, DISPLACED,
     ]
 }