Admin Eye 2-phase broadcast close for clean hand-over

When a new admin Eye spawns, it evicts old admin Eye(s) via 2-phase 'broadcast close' before claiming the wkappbot_elevated pipe. Phase 1 (graceful) signals Global\WKAppBotAdminEyeBroadcastClose named event; listening admins cancel their CTS and exit. Phase 2 (force kill) enumerates wkappbot-core processes and Process.Kill()s them when pipe still present — bootstrap path when old admin lacks the listener. Ensures clean gap (no admin Eye window present) before new takes over, eliminating named-pipe contention.

Steps