Add anti-synergy warnings: CLASHES pairs and per-joker CAUTIONS

Warning-only data in synergies.lua — never touches the synergy score.
Tooltips gain a red 'Clashes - <owned joker>: <why>' line when a hovered
joker fights one you own (Ride the Bus + Pareidolia, Vampire vs Steel
Joker/Lucky Cat, Smeared vs Flower Pot), and a 'Caution:' line in the
buy area for jokers that harm a board you keep (Ceremonial Dagger,
Madness, Stencil). Learning mode keeps warnings — they teach.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

synergies.lua

@@ -214,6 +214,25 @@ local PAIRS = {
     {'j_oops',          'j_lucky_cat',       'better odds, more Lucky payoffs'},
 }
 
+-- Known traps: pairs that actively hurt each other. Warning-only — they
+-- never subtract from the synergy score; the tooltip just flags them with
+-- a red "Clashes" line. Keep warnings under ~34 chars (one tooltip row).
+local CLASHES = {
+    {'j_ride_the_bus', 'j_pareidolia',  'every card counts as a face'},
+    {'j_vampire',      'j_steel_joker', 'drains the Steel it counts'},
+    {'j_vampire',      'j_lucky_cat',   'strips Lucky cards before they pay'},
+    {'j_smeared',      'j_flower_pot',  'merged suits cannot make all four'},
+}
+
+-- Per-joker cautions for the buy-area tooltip: the joker is fine on its
+-- own, but it interacts badly with a board you want to keep. Same length
+-- budget as clash warnings.
+local CAUTIONS = {
+    j_ceremonial = 'eats the joker to its right',
+    j_madness    = 'destroys a random joker each blind',
+    j_stencil    = 'xMult grows with EMPTY joker slots',
+}
+
 -- How to phrase a tag link in the tooltip, from the partner's perspective:
 -- `give` when the partner provides the tag, `want` when the partner consumes
 -- it, `both` for cluster tags where the pair simply shares the theme.
@@ -307,5 +326,5 @@ for _, entry in pairs(J) do
     entry.gives, entry.wants = g, w
 end
 
-return { jokers = J, pairs = PAIRS, tag_text = TAG_TEXT, tag_order = TAG_ORDER,
-    theme_info = THEME_INFO }
+return { jokers = J, pairs = PAIRS, clashes = CLASHES, cautions = CAUTIONS,
+    tag_text = TAG_TEXT, tag_order = TAG_ORDER, theme_info = THEME_INFO }