Add ds7_channel_feasibility.csv (v0.1)

ds7_channel_feasibility.csv

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+channel,throughput_kbps,extra_hybrid_pqc_bytes_per_handshake,added_handshake_latency_ms,ussd_messages_for_mlkem_pk,applet_budget_kb,verdict,note
+2G GPRS,40,2272,454.4,,,HIGH COST — +454.4 ms handshake latency,"voice-era data, dominant rural SSA"
+USSD session,,2272,,7,,INFEASIBLE in-band — ML-KEM pk needs 7 USSD messages,*123# banking; 182 B/message hard cap
+2.75G EDGE,200,2272,90.9,,,FEASIBLE — +90.9 ms handshake latency,agent banking POS uplink
+3G HSPA,1500,2272,12.1,,,FEASIBLE — +12.1 ms handshake latency,smartphone mobile money
+POS terminal (GPRS),40,2272,454.4,,64,HIGH COST — +454.4 ms handshake latency,"card terminal, 64 KB applet RAM budget"
+SIM applet (Java Card),,2272,,,80,FEASIBLE but OK on 80 KB applet budget,"SIM-resident keys, ~80 KB free EEPROM"
+Fixed broadband,20000,2272,0.9,,,FEASIBLE — +0.9 ms handshake latency,reference / urban baseline