[PASS] checkLiveDetailed reports transport_ok=false when Telegram itself errors
[PASS] checkLiveDetailed reports is_member=false on a transport failure (never assumes membership)
[FAIL] checkLiveDetailed reports transport_ok=true for a normal (non-error) API response
[PASS] checkLiveDetailed reports is_member=false for a real "left" status
[FAIL] checkLiveDetailed reports the real status string ("left")
[FAIL] checkLiveDetailed reports is_member=true for a real "member" status
[FAIL] checkLive() (legacy bool API) matches checkLiveDetailed()[is_member] for the same channel
[PASS] checkLive() (legacy bool API) is false for a transport failure (never silently "passes")

PHASE 6 SOFT-JOIN TEST RESULT: FAIL (4 failures)
 - checkLiveDetailed reports transport_ok=true for a normal (non-error) API response
 - checkLiveDetailed reports the real status string ("left")
 - checkLiveDetailed reports is_member=true for a real "member" status
 - checkLive() (legacy bool API) matches checkLiveDetailed()[is_member] for the same channel