dream: dream-run entry point + request/response host adapter + 20 tests

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

lib/dream/conformance.sh

@@ -30,6 +30,7 @@ MODULES=(
   "lib/dream/form.sx"
   "lib/dream/websocket.sx"
   "lib/dream/static.sx"
+  "lib/dream/run.sx"
 )
 
 # Suites: NAME RUNNER-FN PATH
@@ -42,6 +43,7 @@ SUITES=(
   "form        dream-fo-tests-run!  lib/dream/tests/form.sx"
   "websocket   dream-ws-tests-run!  lib/dream/tests/websocket.sx"
   "static      dream-st-tests-run!  lib/dream/tests/static.sx"
+  "run         dream-rn-tests-run!  lib/dream/tests/run.sx"
 )
 
 TMPFILE=$(mktemp); trap "rm -f $TMPFILE" EXIT