Function seedTestActors

Seed a set of test actors into the world for manual and automated testing. Creates:

• Asha Vael (character, friendly) — full spread of swing types, iterators, features
• Grunt (NPC, hostile) — simple melee attacker
• Warden (NPC, neutral) — defensive hold user
• Scout (NPC, friendly/allied) — channel user, evasive feature

Call via: await game.bms.seedTestActors()