commerce: order lifecycle as a durable flow-on-sx flow (21 tests) — Phase 3 done

order.sx — reserve -> await-payment -> fulfil as a flow-on-sx flow carrying
only the order-id; the SX driver services each request by appending to the
persist ledger. order-begin! creates+reserves and suspends at payment;
order-settle! (webhook) resumes -> fulfils, idempotent on replay
(:already-settled). order-flow-restart! simulates a process restart Scheme-side
and the suspended order resumes with the ledger intact. Composes all three
substrates: minikanren pricing -> flow lifecycle -> persist ledger.
Total 153/153 across 9 suites.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/commerce/conformance.sh

@@ -17,7 +17,7 @@ if [ ! -x "$SX_SERVER" ]; then
   exit 1
 fi
 
-SUITES=(catalog cart price api promo stack quote ledger)
+SUITES=(catalog cart price api promo stack quote ledger order)
 
 OUT_JSON="lib/commerce/scoreboard.json"
 OUT_MD="lib/commerce/scoreboard.md"
@@ -48,6 +48,17 @@ run_suite() {
 (load "lib/persist/log.sx")
 (load "lib/persist/kv.sx")
 (load "lib/persist/idempotency.sx")
+(load "lib/guest/lex.sx")
+(load "lib/guest/reflective/env.sx")
+(load "lib/guest/reflective/quoting.sx")
+(load "lib/scheme/parser.sx")
+(load "lib/scheme/eval.sx")
+(load "lib/scheme/runtime.sx")
+(load "lib/flow/spec.sx")
+(load "lib/flow/store.sx")
+(load "lib/flow/remote.sx")
+(load "lib/flow/host.sx")
+(load "lib/flow/api.sx")
 (load "lib/commerce/catalog.sx")
 (load "lib/commerce/cart.sx")
 (load "lib/commerce/price.sx")
@@ -56,6 +67,7 @@ run_suite() {
 (load "lib/commerce/stack.sx")
 (load "lib/commerce/quote.sx")
 (load "lib/commerce/ledger.sx")
+(load "lib/commerce/order.sx")
 (epoch 2)
 (eval "(define ct-pass 0)")
 (eval "(define ct-fail 0)")
@@ -69,7 +81,7 @@ run_suite() {
 EPOCHS
 
   local OUTPUT
-  OUTPUT=$(timeout 300 "$SX_SERVER" < "$TMP" 2>/dev/null)
+  OUTPUT=$(timeout 560 "$SX_SERVER" < "$TMP" 2>/dev/null)
   rm -f "$TMP"
 
   # The (list ct-pass ct-fail) result follows its (ok-len 2 N) ack line.