self-review 2026-05-20: fix wm_active telemetry in heartbeat and curiosity ISEs

engram_wm_count() exists and counts nodes with working_memory_weight > 0.
emit_heartbeat() and proactive_curiosity() were both calling
engram_node_count() (total graph size: ~17K) instead — every heartbeat
and curiosity_scan ISE had been reporting wm_active=17769 since the graph
grew past ~3K nodes, making the metric meaningless for observability.

Fix: use engram_wm_count() for the wm_active field in both ISE payloads.

dist/neuron.c

@@ -26,7 +26,12 @@ el_val_t mem_emit_state_event(el_val_t trigger, el_val_t kind, el_val_t content)
 el_val_t idle_count(void);
 el_val_t idle_inc(void);
 el_val_t idle_reset(void);
+el_val_t ise_post(el_val_t content);
+el_val_t elapsed_ms(void);
+el_val_t elapsed_human(void);
+el_val_t embed_ok(void);
 el_val_t emit_heartbeat(void);
+el_val_t proactive_curiosity(void);
 el_val_t pulse_count(void);
 el_val_t pulse_inc(void);
 el_val_t make_action(el_val_t kind, el_val_t payload);
@@ -94,6 +99,8 @@ el_val_t route_imprint_user(el_val_t body);
 el_val_t route_synthesize(el_val_t body);
 el_val_t handle_dharma_recv(el_val_t body);
 el_val_t route_sessions(void);
+el_val_t parse_session_id_from_path(el_val_t path);
+el_val_t parse_session_subpath(el_val_t path);
 el_val_t handle_request(el_val_t method, el_val_t path, el_val_t body);
 el_val_t init_soul_edges(void);
 el_val_t load_identity_context(void);
@@ -345,7 +352,7 @@ int main(int _argc, char** _argv) {
     }
   }
   println(el_str_concat(EL_STR("[soul] serving on port "), int_to_str(port)));
-  http_serve_async(port, EL_STR("handle_request"));
+  http_serve(port, EL_STR("handle_request"));
   println(EL_STR("[soul] awareness loop starting"));
   awareness_run();
   return 0;