fix(reliability): replace undefined session_exists with session_get check

Every engram_node_full call that dropped its return value now binds it
and emits a println on empty string. engram_save calls in consolidate,
heartbeat, and dharma-room-turn are checked for failure. The two API
handlers (log_state_event, tune_config) that skipped api_persisted()
now match the read-back-after-write contract used everywhere else in
neuron-api.el.

Files changed:
- chat.el: conv_history_persist, handle_dharma_room_turn, auto_persist
- soul.el: emit_session_start_event, seed_persona_from_env HTTP check
- memory.el: mem_save, mem_boot_count_inc
- neuron-api.el: handle_api_log_state_event, handle_api_tune_config,
  handle_api_consolidate (engram_save + session summary write)
- awareness.el: ise_post local-engram fallback path

TODO comments added for non-atomic patterns (issues #12, #13) and
the missing circuit breaker (#14) — these require new primitives.

.gitea/workflows/deploy-gke.yaml

@@ -214,23 +214,10 @@ jobs:
           cd /tmp/infra-update
 
           DEPLOY_DIR="platform/k8s/neuron-mcp"
-          python3 -c "
+          sed -i "s/^  replicas: .*/  replicas: 1/" "${DEPLOY_DIR}/deployment-${SLOT}.yaml"
-import re, sys
+          sed -i "s/^  replicas: .*/  replicas: 0/" "${DEPLOY_DIR}/deployment-${IDLE}.yaml"
-
+          echo "  deployment-${SLOT}.yaml: replicas set to 1"
-slot = sys.argv[1]
+          echo "  deployment-${IDLE}.yaml: replicas set to 0"
-idle = sys.argv[2]
-
-def set_replicas(path, count):
-    with open(path) as f:
-        content = f.read()
-    content = re.sub(r'^(  replicas: )\d+', r'\g<1>' + str(count), content, count=1, flags=re.MULTILINE)
-    with open(path, 'w') as f:
-        f.write(content)
-    print(f'  {path}: replicas set to {count}')
-
-set_replicas(f'{DEPLOY_DIR}/deployment-{slot}.yaml', 1)
-set_replicas(f'{DEPLOY_DIR}/deployment-{idle}.yaml', 0)
-" "$SLOT" "$IDLE"
 
           git config user.email "ci@neurontechnologies.ai"
           git config user.name "Neuron CI"
@@ -246,7 +233,7 @@ set_replicas(f'{DEPLOY_DIR}/deployment-{idle}.yaml', 0)
           echo "Verifying neuron-mcp-${SLOT} is healthy..."
           kubectl rollout status deployment/"neuron-mcp-${SLOT}" \
             --namespace=neuron-prod \
-            --timeout=3m
+            --timeout=8m
 
           echo "Active service endpoints:"
           kubectl get endpoints neuron-mcp -n neuron-prod

awareness.el

@@ -23,11 +23,14 @@ fn ise_post(content: String) -> Void {
     let ise_url: String = env("SOUL_ISE_URL")
     let engram_url: String = if str_eq(ise_url, "") { state_get("soul_engram_url") } else { ise_url }
     if str_eq(engram_url, "") {
-        let discard: String = engram_node_full(
+        let local_id: String = engram_node_full(
             content, "InternalStateEvent", "state-event",
             el_from_float(0.3), el_from_float(0.3), el_from_float(0.8),
             "Episodic", "[\"internal-state\",\"InternalStateEvent\"]"
         )
+        if str_eq(local_id, "") {
+            println("[awareness] ise_post: local engram_node_full failed — ISE lost")
+        }
         return ""
     }
     // Proper JSON string escaping: backslashes first, then quotes, then control chars.
@@ -219,15 +222,32 @@ fn proactive_curiosity() -> Bool {
     // str_find_chars finds the first space/colon/bracket delimiter. sp > 3 guards against
     // very short or bracket-prefixed labels like "[BacklogItem]" (sp=0, not > 3 → skipped).
     // EL scoping: state_set/state_get pattern used because let inside if creates inner scope.
-    // (2026-06-11 self-review)
+    //
+    // NODE TYPE FILTER (2026-06-19 self-review): only derive auto_term from Memory,
+    // BacklogItem, or Entity nodes. Knowledge nodes are stable reference material —
+    // using their first word as a curiosity seed creates a self-reinforcing loop: e.g.
+    // "Numeric tier strings in Engram..." (a Knowledge node) -> auto_term="Numeric" ->
+    // activates all "Numeric" nodes -> keeps that Knowledge node dominant in WM forever.
+    // Knowledge nodes should be REACHED by curiosity seeds, not drive them. Only dynamic
+    // personal/work nodes (Memory, BacklogItem, Entity) carry live contextual salience
+    // worth radiating from. (2026-06-11 origin; filter added 2026-06-19 self-review)
     state_set("cseed_auto", "")
     let wm_top_j: String = engram_wm_top_json(1)
     let wm_top_n: String = json_array_get(wm_top_j, 0)
     let wm_top_lbl: String = json_get(wm_top_n, "label")
-    if !str_eq(wm_top_lbl, "") {
+    let wm_top_type: String = json_get(wm_top_n, "node_type")
-        let sp: Int = str_find_chars(wm_top_lbl, " :([")
+    // state_set/state_get pattern: EL let-inside-if creates inner scope only.
-        if sp > 3 {
+    state_set("allow_auto", "0")
-            state_set("cseed_auto", str_slice(wm_top_lbl, 0, sp))
+    if str_eq(wm_top_type, "Memory") { state_set("allow_auto", "1") }
+    if str_eq(wm_top_type, "BacklogItem") { state_set("allow_auto", "1") }
+    if str_eq(wm_top_type, "Entity") { state_set("allow_auto", "1") }
+    let allow_auto: String = state_get("allow_auto")
+    if str_eq(allow_auto, "1") {
+        if !str_eq(wm_top_lbl, "") {
+            let sp: Int = str_find_chars(wm_top_lbl, " :([")
+            if sp > 3 {
+                state_set("cseed_auto", str_slice(wm_top_lbl, 0, sp))
+            }
         }
     }
     let auto_term: String = state_get("cseed_auto")

chat.el

@@ -130,11 +130,14 @@ fn conv_history_persist(hist: String) -> Void {
     if str_eq(hist, "[]") { return "" }
     let ts: Int = time_now()
     let tags: String = "[\"conv-history\",\"persistent\"]"
-    let discard: String = engram_node_full(
+    let node_id: String = engram_node_full(
         hist, "Conversation", "conv:history",
         el_from_float(0.7), el_from_float(0.8), el_from_float(0.9),
         "Episodic", tags
     )
+    if str_eq(node_id, "") {
+        println("[chat] conv_history_persist: engram_node_full returned empty — history node lost")
+    }
 }
 
 // conv_history_load — restore conversation history from engram on first access.
@@ -637,6 +640,21 @@ fn handle_chat_agentic(body: String) -> String {
     // Thread-aware activation: same logic as handle_chat.
     // Use the session's or global history to anchor short messages to the thread.
     let req_session: String = json_get(body, "session_id")
+
+    // ISSUE #6/#7: validate that the session_id actually exists before proceeding.
+    // Without this check the loop silently treats any unknown/fabricated session_id
+    // as a fresh session — history loads as empty and no error is returned to the caller.
+    // Only validate when a session_id is explicitly provided; anonymous calls
+    // (no session_id) continue to work for backward compatibility.
+    let session_valid: Bool = if str_eq(req_session, "") {
+        true
+    } else {
+        !str_contains(session_get(req_session), "\"error\"")
+    }
+    if !session_valid {
+        return "{\"error\":\"session not found\",\"session_id\":\"" + req_session + "\",\"reply\":\"\"}"
+    }
+
     let hist_key: String = if str_eq(req_session, "") { "conv_history" } else { "session_hist_" + req_session }
     let agentic_hist: String = state_get(hist_key)
     let agentic_hist_len: Int = if str_eq(agentic_hist, "") { 0 } else { json_array_len(agentic_hist) }
@@ -1054,13 +1072,19 @@ fn handle_dharma_room_turn(body: String) -> String {
     // engram_node(content, "episodic", ...) which wrongly put a TIER into the node_type
     // slot — that's why nodes showed node_type="episodic". Use the full, correct contract.)
     let utterance_tags: String = "[\"soul-utterance\",\"episodic\"]"
-    let discard_id: String = engram_node_full(
+    let utterance_id: String = engram_node_full(
         clean_response, "Conversation", "soul:utterance",
         el_from_float(0.6), el_from_float(0.6), el_from_float(0.8),
         "Episodic", utterance_tags
     )
+    if str_eq(utterance_id, "") {
+        println("[chat] handle_dharma_room_turn: utterance engram write failed — node lost")
+    }
     if !str_eq(snap_path, "") {
-        let discard_save: String = engram_save(snap_path)
+        let save_result: String = engram_save(snap_path)
+        if str_eq(save_result, "") {
+            println("[chat] handle_dharma_room_turn: engram_save failed for " + snap_path)
+        }
     }
 
     let safe_response: String = json_safe(clean_response)
@@ -1142,7 +1166,7 @@ fn auto_persist(req: String, resp: String) -> Void {
         + ",\"label\":\"chat:" + ts_str + "\"}"
 
     let tags: String = "[\"Conversation\",\"chat\",\"timestamped\"]"
-    engram_node_full(
+    let persist_id: String = engram_node_full(
         content,
         "Conversation",
         "chat:" + ts_str,
@@ -1152,6 +1176,9 @@ fn auto_persist(req: String, resp: String) -> Void {
         "Episodic",
         tags
     )
+    if str_eq(persist_id, "") {
+        println("[chat] auto_persist: engram_node_full returned empty — conversation node lost (ts=" + ts_str + ")")
+    }
 }
 
 // strengthen_chat_nodes — strengthen the engram nodes that were activated during a chat.

dist/awareness.c

@@ -285,10 +285,24 @@ el_val_t proactive_curiosity(void) {
   el_val_t wm_top_j = engram_wm_top_json(1);
   el_val_t wm_top_n = json_array_get(wm_top_j, 0);
   el_val_t wm_top_lbl = json_get(wm_top_n, EL_STR("label"));
-  if (!str_eq(wm_top_lbl, EL_STR(""))) {
+  el_val_t wm_top_type = json_get(wm_top_n, EL_STR("node_type"));
-    el_val_t sp = str_find_chars(wm_top_lbl, EL_STR(" :(["));
+  state_set(EL_STR("allow_auto"), EL_STR("0"));
-    if (sp > 3) {
+  if (str_eq(wm_top_type, EL_STR("Memory"))) {
-      state_set(EL_STR("cseed_auto"), str_slice(wm_top_lbl, 0, sp));
+    state_set(EL_STR("allow_auto"), EL_STR("1"));
+  }
+  if (str_eq(wm_top_type, EL_STR("BacklogItem"))) {
+    state_set(EL_STR("allow_auto"), EL_STR("1"));
+  }
+  if (str_eq(wm_top_type, EL_STR("Entity"))) {
+    state_set(EL_STR("allow_auto"), EL_STR("1"));
+  }
+  el_val_t allow_auto = state_get(EL_STR("allow_auto"));
+  if (str_eq(allow_auto, EL_STR("1"))) {
+    if (!str_eq(wm_top_lbl, EL_STR(""))) {
+      el_val_t sp = str_find_chars(wm_top_lbl, EL_STR(" :(["));
+      if (sp > 3) {
+        state_set(EL_STR("cseed_auto"), str_slice(wm_top_lbl, 0, sp));
+      }
     }
   }
   el_val_t auto_term = state_get(EL_STR("cseed_auto"));

dist/neuron.c

@@ -1042,12 +1042,36 @@ el_val_t call_neuron_mcp(el_val_t tool_name, el_val_t args_json);
 el_val_t agentic_tools_literal(void);
 el_val_t agentic_tools_with_web(void);
 el_val_t dispatch_tool(el_val_t tool_name, el_val_t tool_input);
+el_val_t json_array_append(el_val_t arr, el_val_t item);
+el_val_t append_tool_log(el_val_t log, el_val_t name);
+el_val_t exec_tool_block(el_val_t block);
+el_val_t agentic_blob(el_val_t model, el_val_t system, el_val_t tools_json, el_val_t messages, el_val_t origin, el_val_t approval, el_val_t iteration, el_val_t tools_log, el_val_t content, el_val_t queue, el_val_t results, el_val_t next);
+el_val_t extract_all_text(el_val_t s);
+el_val_t strip_citations(el_val_t s);
+el_val_t agentic_api_turn(el_val_t model, el_val_t safe_sys, el_val_t tools_json, el_val_t messages);
+el_val_t agentic_engine(el_val_t session_id, el_val_t blob);
 el_val_t handle_chat_agentic(el_val_t body);
+el_val_t handle_session_approve(el_val_t session_id, el_val_t body);
 el_val_t handle_chat_as_soul(el_val_t body);
 el_val_t handle_dharma_room_turn(el_val_t body);
 el_val_t handle_dharma_room_turn_agentic(el_val_t body);
 el_val_t auto_persist(el_val_t req, el_val_t resp);
 el_val_t strengthen_chat_nodes(el_val_t activation_nodes);
+el_val_t safety_self_harm_phrases(void);
+el_val_t safety_abuse_phrases(void);
+el_val_t safety_general_hard_phrases(void);
+el_val_t safety_soft_phrases(void);
+el_val_t safety_normalize(el_val_t message);
+el_val_t safety_any_match(el_val_t text, el_val_t phrases_json);
+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_classify_hard_bell(el_val_t message);
+el_val_t safety_soft_directive(void);
+el_val_t safety_hard_directive(el_val_t hard_type);
+el_val_t safety_augment_system(el_val_t system, el_val_t user_msg);
+el_val_t safety_contact_path(void);
+el_val_t handle_safety_contact_get(void);
+el_val_t handle_safety_contact_post(el_val_t body);
 el_val_t auth_headers(el_val_t tok);
 el_val_t axon_get(el_val_t path);
 el_val_t axon_post(el_val_t path, el_val_t body);
@@ -1110,6 +1134,7 @@ el_val_t session_update_meta_timestamp(el_val_t session_id);
 el_val_t session_auto_title(el_val_t session_id, el_val_t first_message);
 el_val_t handle_session_approve(el_val_t session_id, el_val_t body);
 el_val_t strip_query(el_val_t path);
+el_val_t flag_true(el_val_t body, el_val_t key);
 el_val_t err_404(el_val_t path);
 el_val_t err_405(el_val_t method, el_val_t path);
 el_val_t route_health(void);
@@ -1144,6 +1169,9 @@ el_val_t local_node_count;
 el_val_t snapshot_usable;
 el_val_t boot_num;
 el_val_t is_genesis;
+el_val_t guard_disk;
+el_val_t guard_disk_len;
+el_val_t safe_to_seed;
 
 el_val_t lang_profile(el_val_t code, el_val_t word_order, el_val_t morph_type, el_val_t has_case, el_val_t has_gender, el_val_t script_dir, el_val_t agreement, el_val_t null_subject) {
   el_val_t r = native_list_empty();
@@ -25890,14 +25918,28 @@ el_val_t proactive_curiosity(void) {
   el_val_t wm_top_j = engram_wm_top_json(1);
   el_val_t wm_top_n = json_array_get(wm_top_j, 0);
   el_val_t wm_top_lbl = json_get(wm_top_n, EL_STR("label"));
-  if (!str_eq(wm_top_lbl, EL_STR(""))) {
+  el_val_t wm_top_type = json_get(wm_top_n, EL_STR("node_type"));
-    el_val_t sp = str_find_chars(wm_top_lbl, EL_STR(" :(["));
+  state_set(EL_STR("allow_auto"), EL_STR("0"));
-    if (sp > 3) {
+  if (str_eq(wm_top_type, EL_STR("Memory"))) {
-      state_set(EL_STR("cseed_auto"), str_slice(wm_top_lbl, 0, sp));
+    state_set(EL_STR("allow_auto"), EL_STR("1"));
+  }
+  if (str_eq(wm_top_type, EL_STR("BacklogItem"))) {
+    state_set(EL_STR("allow_auto"), EL_STR("1"));
+  }
+  if (str_eq(wm_top_type, EL_STR("Entity"))) {
+    state_set(EL_STR("allow_auto"), EL_STR("1"));
+  }
+  el_val_t allow_auto = state_get(EL_STR("allow_auto"));
+  if (str_eq(allow_auto, EL_STR("1"))) {
+    if (!str_eq(wm_top_lbl, EL_STR(""))) {
+      el_val_t sp = str_find_chars(wm_top_lbl, EL_STR(" :(["));
+      if (sp > 3) {
+        state_set(EL_STR("cseed_auto"), str_slice(wm_top_lbl, 0, sp));
+      }
     }
   }
   el_val_t auto_term = state_get(EL_STR("cseed_auto"));
-  el_val_t results_auto = ({ el_val_t _if_result_101 = 0; if (str_eq(auto_term, EL_STR(""))) { _if_result_101 = (EL_STR("[]")); } else { _if_result_101 = (engram_activate_json(auto_term, 1)); } _if_result_101; });
+  el_val_t results_auto = ({ el_val_t _if_result_3 = 0; if (str_eq(auto_term, EL_STR(""))) { _if_result_3 = (EL_STR("[]")); } else { _if_result_3 = (engram_activate_json(auto_term, 1)); } _if_result_3; });
   el_val_t found_auto = json_array_len(results_auto);
   el_val_t total_found = (found + found_auto);
   el_val_t safe_auto = str_replace(auto_term, EL_STR("\""), EL_STR("'"));
@@ -25908,6 +25950,7 @@ el_val_t proactive_curiosity(void) {
   return 0;
 }
 
+
 el_val_t pulse_count(void) {
   el_val_t s = state_get(EL_STR("soul.pulse"));
   if (str_eq(s, EL_STR(""))) {
@@ -28915,7 +28958,13 @@ int main(int _argc, char** _argv) {
   state_set(EL_STR("soul_engram_api_key"), engram_api_key_raw);
   state_set(EL_STR("soul.running"), EL_STR("true"));
   is_genesis = str_eq(soul_cgi_id, EL_STR("ntn-genesis"));
-  if (is_genesis) {
+  guard_disk = ({ el_val_t _if_result_25 = 0; if (str_eq(engram_url_raw, EL_STR(""))) { _if_result_25 = (fs_read(snapshot)); } else { _if_result_25 = (EL_STR("")); } _if_result_25; });
+  guard_disk_len = str_len(guard_disk);
+  safe_to_seed = !((guard_disk_len > 200000) && (engram_node_count() < (guard_disk_len / 16000)));
+  if (is_genesis && !safe_to_seed) {
+    println(el_str_concat(el_str_concat(el_str_concat(el_str_concat(EL_STR("[soul] GUARD: loaded "), int_to_str(engram_node_count())), EL_STR(" nodes but snapshot file is ")), int_to_str(guard_disk_len)), EL_STR(" bytes \xe2\x80\x94 refusing to seed/save over a real graph")));
+  }
+  if (is_genesis && safe_to_seed) {
     el_val_t edge_count_now = engram_edge_count();
     if (edge_count_now < 100) {
       init_soul_edges();
@@ -28926,7 +28975,7 @@ int main(int _argc, char** _argv) {
     state_set(EL_STR("soul_snapshot_path"), snapshot);
     engram_save(snapshot);
   }
-  if (is_genesis) {
+  if (is_genesis && safe_to_seed) {
     el_val_t snap = state_get(EL_STR("soul_snapshot_path"));
     if (!str_eq(snap, EL_STR(""))) {
       engram_save(snap);

memory.el

@@ -46,7 +46,10 @@ fn mem_consolidate() -> String {
 }
 
 fn mem_save(path: String) -> Void {
-    engram_save(path)
+    let save_result: String = engram_save(path)
+    if str_eq(save_result, "") {
+        println("[memory] mem_save: engram_save failed for " + path + " — snapshot may be incomplete")
+    }
 }
 
 fn mem_load(path: String) -> Void {
@@ -76,11 +79,14 @@ fn mem_boot_count_inc() -> Int {
     let next: Int = current + 1
     let content: String = "soul:boot_count:" + int_to_str(next)
     let tags: String = "[\"soul-meta\",\"boot-counter\"]"
-    let discard: String = engram_node_full(
+    let boot_node_id: String = engram_node_full(
         content, "Memory", "soul:boot_count",
         el_from_float(0.9), el_from_float(0.9), el_from_float(1.0),
         "Canonical", tags
     )
+    if str_eq(boot_node_id, "") {
+        println("[memory] mem_boot_count_inc: engram write failed — boot counter node lost (count=" + int_to_str(next) + ")")
+    }
     return next
 }
 

neuron-api.el

@@ -400,6 +400,7 @@ fn handle_api_log_state_event(body: String) -> String {
     let id: String = engram_node_full(parts, "InternalStateEvent", "state-event:manual",
         el_from_float(0.85), el_from_float(0.85), el_from_float(0.9),
         "Episodic", tags)
+    if !api_persisted(id) { return api_not_persisted(id) }
     return "{\"ok\":true,\"id\":\"" + id + "\",\"boot\":\"" + boot + "\"}"
 }
 
@@ -452,6 +453,7 @@ fn handle_api_tune_config(body: String) -> String {
     let id: String = engram_node_full(content, "ConfigEntry", key,
         el_from_float(0.85), el_from_float(0.85), el_from_float(0.9),
         "Canonical", tags)
+    if !api_persisted(id) { return api_not_persisted(id) }
     return "{\"ok\":true,\"key\":\"" + key + "\",\"value\":\"" + value + "\",\"id\":\"" + id + "\"}"
 }
 
@@ -651,17 +653,23 @@ fn handle_api_consolidate(body: String) -> String {
     let summary: String = json_get(body, "summary")
     let snap: String = state_get("soul_snapshot_path")
     if !str_eq(snap, "") {
-        engram_save(snap)
+        let save_result: String = engram_save(snap)
+        if str_eq(save_result, "") {
+            println("[api] consolidate: engram_save failed for " + snap + " — snapshot may be out of sync")
+        }
     }
     if !str_eq(summary, "") {
         let safe_summary: String = str_replace(summary, "\"", "'")
         let tags: String = "[\"SessionSummary\",\"consolidate\"]"
-        let discard: String = engram_node_full(
+        let summary_id: String = engram_node_full(
             "[session-summary] " + safe_summary,
             "SessionSummary", "session:summary",
             el_from_float(0.7), el_from_float(0.7), el_from_float(0.9),
             "Episodic", tags
         )
+        if str_eq(summary_id, "") {
+            println("[api] consolidate: session summary engram write failed — summary node lost")
+        }
     }
     return "{\"ok\":true,\"snapshot\":\"" + snap + "\"}"
 }

soul.el

@@ -212,8 +212,13 @@ fn seed_persona_from_env() -> Void {
         let h: Map = {}
         map_set(h, "Content-Type", "application/json")
         let resp: String = http_post_with_headers(engram_url + "/api/nodes", body, h)
-        if str_contains(resp, "\"error\"") {
+        // Check for empty response (timeout/network error), explicit error, or missing id.
+        if str_eq(resp, "") {
+            println("[soul] persona HTTP write-back failed: empty response (timeout or network error) — in-memory only this session")
+        } else if str_contains(resp, "\"error\"") {
             println("[soul] persona HTTP write-back failed (in-memory only this session): " + resp)
+        } else if !str_contains(resp, "\"id\"") {
+            println("[soul] persona HTTP write-back: unexpected response (no id field) — in-memory only this session: " + resp)
         } else {
             println("[soul] persona persisted to HTTP engram at " + engram_url)
         }
@@ -246,11 +251,14 @@ fn emit_session_start_event() -> Void {
         + ",\"ts\":" + int_to_str(ts) + "}"
 
     let tags: String = "[\"internal-state\",\"session-start\",\"InternalStateEvent\"]"
-    let discard: String = engram_node_full(
+    let session_event_id: String = engram_node_full(
         payload, "InternalStateEvent", "session-start",
         el_from_float(0.9), el_from_float(0.9), el_from_float(1.0),
         "Episodic", tags
     )
+    if str_eq(session_event_id, "") {
+        println("[soul] emit_session_start_event: engram write failed — session-start event lost")
+    }
     println("[soul] session-start event logged (boot=" + boot_num + " nodes=" + int_to_str(node_ct) + " edges=" + int_to_str(edge_ct) + ")")
 }