dpslog: WotLK CLEU parity — overkill, overheal, spell names, unit names, GetSpellInfo

Full WotLK 3.3.5 COMBAT_LOG_EVENT_UNFILTERED layout parity:

Event structure:
- Base: subevent, sourceGUID, sourceName, destGUID, destName
- Spell prefix: spellId, spellName, spellSchool
- All suffix field orders match WotLK (blocked before absorbed, etc.)

New fields:
- overkill (-1 if alive) on all _DAMAGE events
- overheal on SPELL_HEAL and SPELL_PERIODIC_HEAL
- sourceName/destName via getNameByGUID (name cache 0x55F080)
- spellName via SpellRec+0x1E0+locale*4 (verified from SuperWoW)
- glancing/crushing as separate booleans (was packed flags)
- amountMissed field (0 — downstream hook lacks amount)

New hooks:
- ProcessStandardPowerGainMessage (0x62CA00) for SPELL_ENERGIZE with
  actual amount and powerType from SMSG_SPELLENERGIZELOG (opcode 0x151)
- Periodic energize: divide by power display factor (rage/10, happiness/1000)

Leech/drain reclassification:
- Drain Life routed through SPELL_PERIODIC_LEECH (aura 53 check in spell DB)
- SPELL_HEAL suppressed for leech spells (covered by leech event)
- Power leech (aura 64): gainMultiplier read as f32, >0 = LEECH, ==0 = DRAIN
- _LEECH/_DRAIN suffix: amount, powerType(-2=health), extraAmount

Lua API:
- GetSpellInfo(spellId) -> name, rank, icon, castTime, minRange, maxRange, spellId
  Matches WotLK returns. DBC addresses verified from nampower + Ghidra:
  SpellRange.dbc (0xC0D79C), SpellIcon.dbc (0xC0D7EC),
  SpellCastTimes.dbc (0xC0D878). SpellRec offsets from nampower struct.

Reference docs:
- WOTLK_CLEU_SPEC.md: full suffix spec from Blizzard_CombatLog.lua + Skada
- WARDEN_CONCERNS.md: hook risk analysis and remaining parity gaps

src/wow.zig

@@ -224,6 +224,22 @@ pub fn getLocalPlayer() u32 {
     return getObjectByGUID(guid);
 }
 
+/// Resolve a GUID to a unit/NPC name via the name cache.
+/// Returns the name string or "" if not cached.
+pub fn getNameByGUID(guid: u64) [*:0]const u8 {
+    if (guid == 0) return "";
+    const lo: u32 = @truncate(guid);
+    const hi: u32 = @truncate(guid >> 32);
+    var name_buf: [2]u32 = .{ 0, 0 };
+    const result = hook.call(fn (u32, u32, u32, u32, u32, u32, u32) callconv(hook.cc.thiscall) u32, o.FN_NAME_CACHE_LOOKUP, .{
+        o.NAME_CACHE_OBJ, lo, hi, @intFromPtr(&name_buf), 0, 0, 0,
+    });
+    if (result != 0) {
+        return @ptrFromInt(result);
+    }
+    return "";
+}
+
 /// Get the current target's GUID.
 pub fn getTargetGUID() u64 {
     return unitGUID("target");