refactor(a2a): the front door's tap and gate become one screening ste… #262

Job	Run time
control a2a-python (the second, independent oracle)	1m 13s
harness selftest (before believing any verdict)	10s
the timezone pin still changes the answer	1m 31s
official TCK vs control (control-jsonrpc)	52s
negative control (a broken peer MUST be red)	30s
official TCK vs control (control-http-json)	45s
governance probe (NOT a conformance result)	34s
control a2a-go (rest)	1m 28s
subject (busbar, built from this commit — ARMED OR RED)	6m 33s
control a2a-go (jsonrpc)	1m 32s
swap proof (six states the gate must tell apart)	2m 13s
A2A conformance verdict	3s
	17m 24s

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