feat(skills): add Amazon class gate and full E2E verification suite (closes #462)
- Add adv-ama-e2e-gate.test.ts covering all 30 Amazon skills (IDs 6–35)
- Verify cross-tree synergies (Guided Arrow + Pierce + Critical Strike, Lightning Fury + Pierce cascades, Valkyrie + Decoy)
- Validate crowd control mechanics (Slow Missiles velocity dampening, Inner Sight flat defense reduction)
- Verify Fend multi-target thrash & 1.13c Dodge/Avoid/Evade evasion interrupt bug handling
- Verify casting delays (Poison Javelin 12f, Plague Javelin 100f, Immolation Arrow 25f, Valkyrie 150f)
- 36/36 Amazon test files passing (182/182 tests green), typecheck clean, 0 regressions