PASS Actual config: upgraded installation without stored key becomes 3
PASS Actual config: fresh installation without stored key becomes 7
PASS Actual config: saved 3 preserved
PASS Actual config: invalid 11 repaired to 7
PASS Actual extracted flow: 7 consecutive empty callbacks end exactly once
PASS Actual extracted flow: same ordinary valid code clears empty counter
PASS Actual extracted methods: three nonempty short codes become empty and trigger removal
PASS Actual extracted cleaner: CRLF appended to six digits is rejected before cleaning (PC681 parser normally trims ends first)
PASS Actual extracted normal-flow branch: ignored admin code does not reset empty count
PASS Actual extracted flow: 3 callbacks without delays end (duration_us=4)
PASS Actual extracted routing: a different valid code directly starts recognition without removal callback