self-review 2026-06-10: fix ise_post JSON escaping + rebuild soul daemon

Two fixes:

1. ise_post was only escaping " in content strings. When wm_top contained
   node labels with \n (backslash-n escape sequences from jb_emit_escaped),
   the HTTP Engram server's JSON parser decoded \n as a literal newline in
   the stored content, making heartbeat ISEs unparseable. Fix: escape
   backslashes first, then quotes, then \n and \r — matching make_action's
   existing pattern. Result: heartbeat ISEs now parse cleanly.

2. Soul daemon (dist/neuron) was missing — the build command in the prompt
   was linking all 46 dist/*.c files together, causing 1092 duplicate symbol
   errors. EL compiles transitive imports inline so neuron.c is self-contained;
   correct build links ONLY neuron.c + el_runtime.c. Daemon now starts.

awareness.el

@@ -30,8 +30,16 @@ fn ise_post(content: String) -> Void {
         )
         return ""
     }
-    let safe: String = str_replace(content, "\"", "\\\"")
-    let body: String = "{\"content\":\"" + safe + "\"}"
+    // Proper JSON string escaping: backslashes first, then quotes, then control chars.
+    // Previously only escaped " — this caused ise_post to produce malformed JSON when
+    // content contained \n (backslash-n) from wm_top label escaping: the HTTP Engram
+    // server would decode \n as a literal newline in the stored content field, making
+    // the heartbeat ISE unparseable as JSON. (2026-06-10 self-review)
+    let safe1: String = str_replace(content, "\\", "\\\\")
+    let safe2: String = str_replace(safe1, "\"", "\\\"")
+    let safe3: String = str_replace(safe2, "\n", "\\n")
+    let safe4: String = str_replace(safe3, "\r", "\\r")
+    let body: String = "{\"content\":\"" + safe4 + "\"}"
     let discard: String = http_post_json(engram_url + "/api/neuron/state-events", body)
     return ""
 }

dist/awareness.c

@@ -174,8 +174,11 @@ el_val_t ise_post(el_val_t content) {
     el_val_t discard = engram_node_full(content, EL_STR("InternalStateEvent"), EL_STR("state-event"), el_from_float(el_from_float(0.3)), el_from_float(el_from_float(0.3)), el_from_float(el_from_float(0.8)), EL_STR("Episodic"), EL_STR("[\"internal-state\",\"InternalStateEvent\"]"));
     return EL_STR("");
   }
-  el_val_t safe = str_replace(content, EL_STR("\""), EL_STR("\\\""));
-  el_val_t body = el_str_concat(el_str_concat(EL_STR("{\"content\":\""), safe), EL_STR("\"}"));
+  el_val_t safe1 = str_replace(content, EL_STR("\\"), EL_STR("\\\\"));
+  el_val_t safe2 = str_replace(safe1, EL_STR("\""), EL_STR("\\\""));
+  el_val_t safe3 = str_replace(safe2, EL_STR("\n"), EL_STR("\\n"));
+  el_val_t safe4 = str_replace(safe3, EL_STR("\r"), EL_STR("\\r"));
+  el_val_t body = el_str_concat(el_str_concat(EL_STR("{\"content\":\""), safe4), EL_STR("\"}"));
   el_val_t discard = http_post_json(el_str_concat(engram_url, EL_STR("/api/neuron/state-events")), body);
   return EL_STR("");
   return 0;

dist/neuron.c

@@ -25299,8 +25299,11 @@ el_val_t ise_post(el_val_t content) {
     el_val_t discard = engram_node_full(content, EL_STR("InternalStateEvent"), EL_STR("state-event"), el_from_float(el_from_float(0.3)), el_from_float(el_from_float(0.3)), el_from_float(el_from_float(0.8)), EL_STR("Episodic"), EL_STR("[\"internal-state\",\"InternalStateEvent\"]"));
     return EL_STR("");
   }
-  el_val_t safe = str_replace(content, EL_STR("\""), EL_STR("\\\""));
-  el_val_t body = el_str_concat(el_str_concat(EL_STR("{\"content\":\""), safe), EL_STR("\"}"));
+  el_val_t safe1 = str_replace(content, EL_STR("\\"), EL_STR("\\\\"));
+  el_val_t safe2 = str_replace(safe1, EL_STR("\""), EL_STR("\\\""));
+  el_val_t safe3 = str_replace(safe2, EL_STR("\n"), EL_STR("\\n"));
+  el_val_t safe4 = str_replace(safe3, EL_STR("\r"), EL_STR("\\r"));
+  el_val_t body = el_str_concat(el_str_concat(EL_STR("{\"content\":\""), safe4), EL_STR("\"}"));
   el_val_t discard = http_post_json(el_str_concat(engram_url, EL_STR("/api/neuron/state-events")), body);
   return EL_STR("");
   return 0;