agentic-sx Phase 4: durable — agent sessions as durable flow workflows (TDD)

Deterministic replay IS the durability mechanism: every transition re-runs a
self-contained flow program (defflow source + flow/start + replay of all
recorded resume values), so the only durable state is {:flow :input :resumes}
in persist kv — restart-safe by construction (fresh space handles over the
same backend resume mid-flight runs). fork-an-agent-run = copy the record;
the two replays diverge independently. Effects are data (suspend tags +
typed request envelopes surface as plain SX); transitions ride the Phase-3
trace buffer so session history travels with the next commit. Guest numeric
results compared with = per house convention. 43/43 (196/196 total).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

lib/agentic/conformance.sh

@@ -13,7 +13,7 @@ if [ ! -x "$SX_SERVER" ]; then
   exit 1
 fi
 
-SUITES=(schema branch trace)
+SUITES=(schema branch trace durable)
 
 OUT_JSON="lib/agentic/scoreboard.json"
 OUT_MD="lib/agentic/scoreboard.md"