pathwayd: HTTP service over internal/pathway · 11/11 smoke gate

Network-callable Mem0-style trace memory at :3217, fronted by gateway
/v1/pathway/*. Closes the ADR-004 wire-up: store substrate landed in
2a6234f, this lands the HTTP surface + [pathwayd] config + acceptance
gate.

Smoke proves the architecturally distinctive properties: Revise →
History walks the predecessor chain backward (audit trail), Retire
excludes from Search default but stays Get-able, AddIdempotent bumps
replay_count without replacing — and all survive kill+restart via
JSONL log replay.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cmd/gateway/main.go

@@ -44,6 +44,7 @@ func main() {
 		"queryd_url":   cfg.Gateway.QuerydURL,
 		"vectord_url":  cfg.Gateway.VectordURL,
 		"embedd_url":   cfg.Gateway.EmbeddURL,
+		"pathwayd_url": cfg.Gateway.PathwaydURL,
 	}
 	for k, v := range upstreams {
 		if v == "" {
@@ -63,6 +64,7 @@ func main() {
 	querydURL := mustParseUpstream("queryd_url", cfg.Gateway.QuerydURL)
 	vectordURL := mustParseUpstream("vectord_url", cfg.Gateway.VectordURL)
 	embeddURL := mustParseUpstream("embedd_url", cfg.Gateway.EmbeddURL)
+	pathwaydURL := mustParseUpstream("pathwayd_url", cfg.Gateway.PathwaydURL)
 
 	storagedProxy := gateway.NewProxyHandler(storagedURL)
 	catalogdProxy := gateway.NewProxyHandler(catalogdURL)
@@ -70,6 +72,7 @@ func main() {
 	querydProxy := gateway.NewProxyHandler(querydURL)
 	vectordProxy := gateway.NewProxyHandler(vectordURL)
 	embeddProxy := gateway.NewProxyHandler(embeddURL)
+	pathwaydProxy := gateway.NewProxyHandler(pathwaydURL)
 
 	if err := shared.Run("gateway", cfg.Gateway.Bind, func(r chi.Router) {
 
@@ -88,6 +91,8 @@ func main() {
 		r.Handle("/v1/vectors/*", vectordProxy)
 		// Embedding service — /v1/embed
 		r.Handle("/v1/embed", embeddProxy)
+		// Pathway memory — /v1/pathway/*
+		r.Handle("/v1/pathway/*", pathwaydProxy)
 	}, cfg.Auth); err != nil {
 		slog.Error("server", "err", err)
 		os.Exit(1)