feat: Hybrid OS-level + HTTP fault injection (70B Killer v2)

polish: professional cleanup for submission

fix: increase drain rate 50→200, generate SFT data (14 expert demos)

fix(audit): 9 interlocking bugs across all tiers

fix(critical): cascade faults now ACTUALLY degrade services

fix: command executor routing for subprocess mode + reward gaming protection + mutable default bug

feat: CloudSRE v2 — complete environment with adaptive sampling