fix(api): /api/neuron/list/<type> off-by-one — slice 16->17

str_slice(clean, 16, ...) left a leading slash on node_type ('/BacklogItem'), so
engram_scan_nodes_by_type_json matched nothing and list/<type> returned [] for EVERY type — silently
breaking backlog + typed-node listing across the app and MCP tools (reviewBacklog). Proven live: the
literal-scan endpoint /api/neuron/knowledge returns nodes; /api/neuron/list/Knowledge returned []. elc-clean.
NOTE: soul-core — needs dist/soul.c regen (Will); rides the same rebuild as #56/#57.

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

dist/elp-c-decls.h

@@ -2,6 +2,7 @@
 #include "el_runtime.h"
 
 el_val_t add_punct(el_val_t s, el_val_t intent);
+el_val_t add_to_seen(el_val_t seen, el_val_t node_id);
 el_val_t aff_try_slot(el_val_t slot_json, el_val_t aff_7d_ts, el_val_t acc_key);
 el_val_t agent_number(el_val_t agent);
 el_val_t agent_person(el_val_t agent);
@@ -93,8 +94,10 @@ el_val_t api_err(el_val_t msg);
 el_val_t api_err_protected(el_val_t id);
 el_val_t api_json_escape(el_val_t s);
 el_val_t api_nonempty(el_val_t s);
+el_val_t api_not_persisted(el_val_t id);
 el_val_t api_ok(el_val_t extra);
 el_val_t api_or_empty(el_val_t s);
+el_val_t api_persisted(el_val_t id);
 el_val_t api_query_int(el_val_t path, el_val_t key, el_val_t default_val);
 el_val_t api_query_param(el_val_t path, el_val_t key);
 el_val_t append_tool_log(el_val_t log, el_val_t name);
@@ -138,6 +141,7 @@ el_val_t build_np(el_val_t referent, el_val_t slots);
 el_val_t build_pp(el_val_t loc);
 el_val_t build_rules(void);
 el_val_t build_system_prompt(el_val_t ctx);
+el_val_t build_system_prompt(el_val_t ctx, el_val_t chat_mode);
 el_val_t build_vocab(void);
 el_val_t build_vp_body(el_val_t slots);
 el_val_t build_vp_from_slots(el_val_t slots);
@@ -254,6 +258,19 @@ el_val_t en_verb_form(el_val_t base, el_val_t tense, el_val_t person, el_val_t n
 el_val_t en_verb_gerund(el_val_t base);
 el_val_t en_verb_past(el_val_t base);
 el_val_t engram_compile(el_val_t intent);
+el_val_t engram_compile_multi(el_val_t topic);
+el_val_t engram_compile_ranked(el_val_t nodes_json, el_val_t max_nodes);
+el_val_t engram_dedup_nodes(el_val_t nodes_json);
+el_val_t engram_detect_recall_intent(el_val_t message);
+el_val_t engram_extract_entities(el_val_t message);
+el_val_t engram_extract_ids(el_val_t nodes_json);
+el_val_t engram_is_continuation(el_val_t message, el_val_t hist_len);
+el_val_t engram_nodes_merge(el_val_t a, el_val_t b);
+el_val_t engram_numeric_valid(el_val_t s);
+el_val_t engram_render_node(el_val_t node_json);
+el_val_t engram_render_nodes(el_val_t nodes_json);
+el_val_t engram_score_node(el_val_t node_json);
+el_val_t engram_split_topics(el_val_t message);
 el_val_t enm_been_past(el_val_t slot);
 el_val_t enm_been_present(el_val_t slot);
 el_val_t enm_comen_past(el_val_t slot);
@@ -567,6 +584,9 @@ el_val_t handle_api_list_typed(el_val_t node_type, el_val_t path, el_val_t body)
 el_val_t handle_api_log_state_event(el_val_t body);
 el_val_t handle_api_memory_delete(el_val_t body);
 el_val_t handle_api_memory_update(el_val_t body);
+el_val_t handle_api_node_create(el_val_t body);
+el_val_t handle_api_node_delete(el_val_t body);
+el_val_t handle_api_node_update(el_val_t body);
 el_val_t handle_api_promote_knowledge(el_val_t body);
 el_val_t handle_api_recall(el_val_t method, el_val_t path, el_val_t body);
 el_val_t handle_api_remember(el_val_t body);
@@ -648,6 +668,8 @@ el_val_t hi_verb_stem(el_val_t infinitive);
 el_val_t hi_verb_stem_clean(el_val_t infinitive);
 el_val_t hist_append(el_val_t hist, el_val_t role, el_val_t content);
 el_val_t hist_trim(el_val_t hist);
+el_val_t hist_trim_with_bell_guard(el_val_t hist);
+el_val_t id_in_seen(el_val_t node_id, el_val_t seen);
 el_val_t idle_count(void);
 el_val_t idle_inc(void);
 el_val_t idle_reset(void);
@@ -836,6 +858,7 @@ el_val_t non_vera_present(el_val_t slot);
 el_val_t non_weak_past(el_val_t stem, el_val_t slot);
 el_val_t non_weak_present(el_val_t stem, el_val_t slot);
 el_val_t one_cycle(void);
+el_val_t parse_float_x100(el_val_t s);
 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 path_within_root(el_val_t path, el_val_t root);
@@ -970,6 +993,7 @@ el_val_t safety_classify_hard_bell(el_val_t message);
 el_val_t safety_contact_path(void);
 el_val_t safety_count_match(el_val_t text, el_val_t phrases_json);
 el_val_t safety_detect_bell_level(el_val_t message);
+el_val_t safety_detect_positive_level(el_val_t message);
 el_val_t safety_general_hard_phrases(void);
 el_val_t safety_hard_directive(el_val_t hard_type);
 el_val_t safety_log_bell(el_val_t level, el_val_t reason, el_val_t input_summary);
@@ -1007,13 +1031,19 @@ el_val_t sem_to_spec(el_val_t frame);
 el_val_t sem_to_spec_full(el_val_t frame, el_val_t verb, el_val_t tense, el_val_t aspect);
 el_val_t session_auto_title(el_val_t session_id, el_val_t first_message);
 el_val_t session_create(el_val_t body);
+el_val_t session_create_cleanup(el_val_t session_id);
 el_val_t session_delete(el_val_t session_id);
+el_val_t session_exists(el_val_t session_id);
 el_val_t session_get(el_val_t session_id);
 el_val_t session_hist_load(el_val_t session_id);
 el_val_t session_hist_save(el_val_t session_id, el_val_t hist);
 el_val_t session_list(void);
 el_val_t session_make_content(el_val_t id, el_val_t title, el_val_t created_at, el_val_t updated_at, el_val_t folder);
+el_val_t session_preload_bullets(el_val_t nodes, el_val_t max_bullets, el_val_t snip_len);
 el_val_t session_search(el_val_t query);
+el_val_t session_summary_autogenerate(el_val_t hist);
+el_val_t session_summary_write(el_val_t summary_text);
+el_val_t session_summary_write_dated(el_val_t summary_text, el_val_t label);
 el_val_t session_title_from_message(el_val_t message);
 el_val_t session_update_meta_timestamp(el_val_t session_id);
 el_val_t session_update_patch(el_val_t session_id, el_val_t body);

routes.el

@@ -459,7 +459,10 @@ fn handle_request(method: String, path: String, body: String) -> String {
             return handle_api_inspect_graph(method, path, body)
         }
         if str_starts_with(clean, "/api/neuron/list/") {
-            let node_type: String = str_slice(clean, 16, str_len(clean))
+            // Offset 17 = len("/api/neuron/list/"). Was 16, which left a leading "/" on node_type
+            // ("/BacklogItem"), so engram_scan_nodes_by_type_json matched nothing → list/<type>
+            // returned [] for EVERY type (broke backlog/typed-node listing app- and tool-wide).
+            let node_type: String = str_slice(clean, 17, str_len(clean))
             return handle_api_list_typed(node_type, path, body)
         }
         if str_starts_with(clean, "/api/neuron/recall") {