[Threat Proposal] Critical: T-EVADE-005 -> External Dependency Staging (Dependency Spoofing)

[Sumi0]

"Defense Evasion via Socially Engineered External Prerequisites"
[Sub-type to T-EVADE-004]
While T-EVADE-004 covers a skill automatically fetching code at runtime, this T-EVADE-005 is a social engineering hybrid. It doesn't fetch the code invisibly in the background; it tricks the user into manually downloading and executing the payload by masquerading as a prerequisite.

Details in Detailed PR:
#3