[Bug]: Explosive Trap initial blast missing directCoefficient (TBC 10% RAP)

[Xerrion]

Problem

Data/SpellData_Hunter.lua Explosive Trap (spellID 13813 and ranks) is encoded as a hybrid spell with directCoefficient = 0.00 and dotCoefficient = 0.10. The DoT-side scaling is correct, but the initial blast on trigger should also scale at 10% ranged attack power per the TBC empirical table.

Empirical TBC value

WoWWiki Attack_power_coefficient archive (Hunter > Survival section):

• Explosive Trap initial blast: 10% RAP (one-time, applied to the direct damage on trigger)
• Explosive Trap DoT: 10% RAP total over the DoT duration (already correctly stored as 0.10)

The two coefficients are independent and BOTH apply to a single Explosive Trap proc.

Expected fix

Set directCoefficient = 0.10 on the Explosive Trap entries in Data/SpellData_Hunter.lua. The DoT coefficient stays at 0.10. With RAP=2000 this adds 200 damage to the initial blast on top of base.

Discovery context

Found during the AoE coefficient audit for #46 but deliberately excluded from that PR per scope discipline (Explosive Trap is a Hunter trap correction, not an AoE penalty correction in the same vein as the Mage/Druid/Warlock spells).

Acceptance criteria

• Explosive Trap entry sets directCoefficient = 0.10.
• A regression test in tests/ pins both directCoefficient and dotCoefficient and asserts Pipeline.Calculate produces the expected combined initial+DoT damage.
• Source citation comment added.
• luacheck . clean, busted --verbose passes.

Source

• WoWWiki Attack_power_coefficient archive (Hunter > Survival table)