fed-sx-types Phase 6: DefineTrigger verb + trigger_registry

The trigger declaration layer (fed-sx-triggers-loop.md Phase 1): bind an
activity-type to a durable flow so an arriving activity can fan out into
a business flow.

- next/genesis/activity-types/define_trigger.sx — the DefineTrigger verb
  (DefineActivity form, nested-get schema). :object carries
  :activity-type, :flow-name, optional :guard / :actor-scope.
- next/kernel/trigger_registry.erl — pure core + registered gen_server,
  mirroring peer_actors/peer_types. Keyed by activity-type, multiple
  specs per type fire independently. Spec = {TriggerCid, FlowName,
  Guard, ActorScope}. Hydrates on start from a fold over DefineTrigger
  activities (restart-safe, same content-addressing as define_registry).

Manifest activity-types 7->8 (total bundle 38->39); the four bootstrap
count suites + genesis_parse bumped, and bootstrap_load's internal
timeout raised (the larger bundle's double cid:to_string was truncating).

Tests: define_trigger.sh (6), trigger_registry.sh (17). lib/erlang
771/771 + next/flow 34/34 untouched.

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

next/tests/define_trigger.sh

@@ -0,0 +1,99 @@
+#!/usr/bin/env bash
+# next/tests/define_trigger.sh — fed-sx triggers Phase 1 (verb).
+#
+# The DefineTrigger genesis verb
+# (next/genesis/activity-types/define_trigger.sx) binds an activity-type
+# to a flow. This suite confirms it parses with the expected
+# DefineActivity head + :name, that its :schema accepts a well-formed
+# binding and rejects malformed ones, and that a DefineTrigger envelope
+# round-trips through term_codec.
+
+set -uo pipefail
+cd "$(git rev-parse --show-toplevel)"
+
+SX_SERVER="${SX_SERVER:-hosts/ocaml/_build/default/bin/sx_server.exe}"
+if [ ! -x "$SX_SERVER" ]; then
+  SX_SERVER="/root/rose-ash/hosts/ocaml/_build/default/bin/sx_server.exe"
+fi
+if [ ! -x "$SX_SERVER" ]; then
+  echo "ERROR: sx_server.exe not found." >&2
+  exit 1
+fi
+
+VERBOSE="${1:-}"
+PASS=0; FAIL=0; ERRORS=""
+TMPFILE=$(mktemp); trap "rm -f $TMPFILE" EXIT
+
+SCH='(eval-expr (get (apply dict (rest (parse (file-read \"next/genesis/activity-types/define_trigger.sx\")))) :schema))'
+
+cat > "$TMPFILE" <<EPOCHS
+(epoch 1)
+(load "lib/erlang/tokenizer.sx")
+(load "lib/erlang/parser.sx")
+(load "lib/erlang/parser-core.sx")
+(load "lib/erlang/parser-expr.sx")
+(load "lib/erlang/parser-module.sx")
+(load "lib/erlang/transpile.sx")
+(load "lib/erlang/runtime.sx")
+(load "lib/erlang/vm/dispatcher.sx")
+(epoch 2)
+(eval "(get (erlang-load-module (file-read \"next/kernel/term_codec.erl\")) :name)")
+
+;; ── parse / shape ──────────────────────────────────────────
+(epoch 10)
+(eval "(first (parse (file-read \"next/genesis/activity-types/define_trigger.sx\")))")
+(epoch 11)
+(eval "(get (apply dict (rest (parse (file-read \"next/genesis/activity-types/define_trigger.sx\")))) :name)")
+
+;; ── schema accept / reject ─────────────────────────────────
+;; valid binding: string :activity-type + :flow-name -> true
+(epoch 20)
+(eval "(define sch ${SCH}) (sch (dict :object (dict :activity-type \"Create\" :flow-name \"blog-publish-digest\")))")
+;; reject: missing :activity-type -> false
+(epoch 21)
+(eval "(define sch ${SCH}) (sch (dict :object (dict :flow-name \"f\")))")
+;; reject: missing :flow-name -> false
+(epoch 22)
+(eval "(define sch ${SCH}) (sch (dict :object (dict :activity-type \"Create\")))")
+
+;; ── envelope round-trip through term_codec ─────────────────
+(epoch 30)
+(eval "(get (erlang-eval-ast \"A = [{type, define_trigger}, {actor, alice}, {object, [{activity_type, create}, {flow_name, blog_publish_digest}]}], {ok, D, _} = term_codec:decode(term_codec:encode(A)), D =:= A\") :name)")
+EPOCHS
+
+OUTPUT=$(timeout 180 "$SX_SERVER" < "$TMPFILE" 2>/dev/null)
+
+check() {
+  local epoch="$1" desc="$2" expected="$3"
+  local actual
+  actual=$(echo "$OUTPUT" | awk -v e="$epoch" '
+    $0 ~ "^\\(ok-len " e " " { getline; print; exit }
+    $0 ~ "^\\(ok " e " "     { print; exit }
+    $0 ~ "^\\(error " e " "  { print; exit }
+  ')
+  [ -z "$actual" ] && actual="<no output for epoch $epoch>"
+  if echo "$actual" | grep -qF -- "$expected"; then
+    PASS=$((PASS+1))
+    [ "$VERBOSE" = "-v" ] && echo "  ok $desc"
+  else
+    FAIL=$((FAIL+1))
+    ERRORS+="  FAIL [$desc] (epoch $epoch) expected: $expected | actual: $actual
+"
+  fi
+}
+
+check 10 "define_trigger.sx head form"      "DefineActivity"
+check 11 "define_trigger.sx name"           "DefineTrigger"
+check 20 "schema accepts valid binding"     "true"
+check 21 "schema rejects missing type"      "false"
+check 22 "schema rejects missing flow-name" "false"
+check 30 "DefineTrigger envelope round-trips" "true"
+
+TOTAL=$((PASS+FAIL))
+if [ $FAIL -eq 0 ]; then
+  echo "ok $PASS/$TOTAL next/tests/define_trigger.sh passed"
+else
+  echo "FAIL $PASS/$TOTAL passed, $FAIL failed:"
+  echo "$ERRORS"
+fi
+[ $FAIL -eq 0 ]