Paragon: cross-class talents + Warrior stance bypass + Mirror Image spellbook draw

Server-side cross-class wildcard pass for several talents that were
previously locked to a single SpellFamilyName, plus a server+client
Warrior stance bypass and a Paragon-aware Mirror Image rebuild that
mimics the owner's spellbook instead of stock Frostbolt/Fire Blast.

Talent expansions (Paragon owners only; stock classes unchanged):
- Cold Snap (11958): resets cooldown of any Frost-school spell.
- Nature's Swiftness (17116, 16188) + Predator's Swiftness (69369):
  instant-cast on any Nature-school spell.
- Vampiric Embrace (15286): leech-heals from any single-target
  Shadow-school spell.
- Fingers of Frost (44543/44545) + Frostbite (11071/12496/12497):
  proc from any Frost-school chill effect (DK Howling Blast / Icy
  Touch / Chains of Ice, Hunter Frost Trap, Shaman Frost Shock,
  cross-class chill auras via SPELL_AURA_MOD_DECREASE_SPEED).
- Maelstrom Weapon (53817): now also affects Mage Fireball (133),
  Frostbolt (116), and Arcane Blast (30451) at every rank, both
  for cast-time/cost spellmod and for stack consumption.

Warrior stance bypass:
- SpellInfo::CheckShapeshift returns SPELL_CAST_OK whenever a
  Paragon caster hits any Stances!=0 spell (no SpellFamilyName
  gate). Stock classes still see the regular form rules.
- Client side: patch-enUS-4.MPQ now zeroes Stances on every
  SPELLFAMILY_WARRIOR Spell.dbc row (105 spells) so the engine's
  pre-cast "Must be in Battle/Defensive/Berserker Stance" check
  no longer eats CMSG_CAST_SPELL packets for Paragons. Server
  bypass enforces the actual decision; stock Warriors still
  error mid-cast if they actually click while out of stance.
- patch-enUS-5.MPQ Lua tooltip post-processor recolors and
  appends "(Paragon: bypassed)" to "Requires *Stance*" lines on
  Warrior abilities, plus Paragon notes on Maelstrom Weapon and
  Mirror Image tooltips. Action-bar UseAction wrapper routes
  stance-gated Warrior spell clicks through CastSpellByName so
  the stance-zero DBC + server bypass actually run.

Mirror Image:
- npc_pet_mage_mirror_image rebuilds its spell list from the
  Paragon owner's spellbook on InitializeAI AND JustEngagedWith
  (the second pass + events.Reset clears any stale events the
  CasterAI base scheduler may have queued from stock 59637 /
  59638 entries before the rebuild ran).
- Curated filter keeps single-target damaging spells (instant,
  cast-time, or channeled) with a base cooldown <=10s, with the
  "damaging" definition expanded to include
  SPELL_EFFECT_TRIGGER_MISSILE and
  SPELL_AURA_PERIODIC_TRIGGER_SPELL so Arcane Missiles
  qualifies. Rejects passives, AoE, melee/ranged weapon strikes,
  item/reagent/stance/equip-gated, and lower spell ranks.
- UpdateAI picks a random spell from the curated list per cast
  and reschedules the next pick by the actually-cast spell's
  cast/channel duration + 750ms breather, so a 5s Arcane
  Missiles channel waits its full duration before re-rolling
  rather than visually looping across four images.

Helpers:
- Unit::IsParagonWildcardCaller / Unit::ParagonFamilyMatches
  used by Spell.cpp, SpellInfo.cpp, Player.cpp,
  SpellAuraEffects.cpp, and the spell scripts.
- SpellInfo::CheckShapeshift signature gains an optional caster
  pointer; all call sites updated.

SQL migrations under modules/mod-paragon/data/sql/db-world/updates/:
- 2026_05_11_01.sql  Vampiric Embrace spell_proc relax + script
                     gate (CheckProc enforces stock for non-Paragon).
- 2026_05_11_02.sql  Maelstrom Weapon spell_proc relax (initial,
                     superseded by _04 below for stack-consumption fix).
- 2026_05_11_03.sql  Fingers of Frost / Frostbite spell_proc relax
                     and spell_script_names binding.
- 2026_05_11_04.sql  Maelstrom Weapon spell_proc fixup: restore
                     SpellPhaseMask=1 (CAST) and AttributesMask=8
                     (REQ_SPELLMOD); previous _02 set 8/0 which
                     silently dropped every proc event.

Diagnostics from this debugging session demoted from LOG_INFO to
LOG_DEBUG (silent at default info level) so production logs stay
quiet but the probes remain available for reproducing future
regressions: pet_mage.cpp MirrorImage probe/kept/rebuild/init/
engage/cast lines and SpellInfo.cpp CheckShapeshift bypass line.

CLIENT-PATCHES.md updated to document the new Warrior stance DBC
patcher (_patch_spell_dbc_stances.py), the spell-tooltip post-
processor and stance UseAction wrapper in patch-enUS-5.MPQ, and
the Mirror Image / Maelstrom Weapon Paragon notes.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/server/scripts/Spells/spell_priest.cpp

@@ -1005,12 +1005,38 @@ class spell_pri_vampiric_embrace : public AuraScript
 
     bool CheckProc(ProcEventInfo& eventInfo)
     {
-        // Not proc from Mind Sear
         SpellInfo const* procSpell = eventInfo.GetSpellInfo();
         if (!procSpell)
             return false;
 
-        return !(procSpell->SpellFamilyFlags[1] & 0x80000);
+        // Stock: filter Mind Sear (the damage-tick spell carries this
+        // SpellFamilyFlags[1] bit; the channel itself is filtered by the
+        // standard data-row mask). Kept as a bit-test so the stock priest
+        // path is byte-identical to before this change.
+        if (procSpell->SpellFamilyFlags[1] & 0x80000)
+            return false;
+
+        // Fractured / Paragon: any single-target Shadow-school damage spell
+        // procs Vampiric Embrace, not just Priest Shadow spells. The
+        // SchoolMask=Shadow gate is enforced by the spell_proc data row
+        // (SchoolMask=32). The data-row family/mask was wildcarded in
+        // mod-paragon's 2026_05_11_01.sql update so this CheckProc fires for
+        // cross-family Shadow spells; here we add the single-target
+        // requirement (Mind Sear was already filtered above; this also
+        // catches AoE Warlock Shadow spells like Seed of Corruption,
+        // Hellfire, etc. that a Paragon could otherwise cast).
+        if (IsParagonWildcardCaller(GetTarget()))
+            return !procSpell->IsAffectingArea();
+
+        // Stock priest path: re-enforce the original Priest Shadow damage
+        // gate that used to live entirely in the data row. Without this,
+        // wildcarding the data row would let item-cast Shadow effects
+        // (consumables, trinkets) accidentally proc VE on stock priests.
+        if (procSpell->SpellFamilyName != SPELLFAMILY_PRIEST)
+            return false;
+        return (procSpell->SpellFamilyFlags[0] & 0x0280A010)
+            || (procSpell->SpellFamilyFlags[1] & 0x00002402)
+            || (procSpell->SpellFamilyFlags[2] & 0x00000008);
     }
 
     void HandleProc(AuraEffect const* aurEff, ProcEventInfo& eventInfo)