Vamooses Companions

FIXED:
- Secret-value taint crash in VC_ActivitySense idle timer. After today's
  Blizzard patch tightened secret-value handling, the pre-guard
  InCombatLockdown() check inside the 90s idle timer callback could itself
  come back secret-tainted, crashing before the secret-context guard ran.
  Removed the pre-guard combat check -- the instanced-combat branch of the
  secret-context guard below already covers it, and the rare case of firing
  an idle emit during world combat is harmless.
- /reload during M+, raid encounters, PvP, or instanced combat no longer
  taints ActivitySense's bootstrap pass. Wrapped the UnitIsDead/UnitIsGhost
  probe in the same secret-context guard used elsewhere in the module.