fix(safety): wire safety augment into system prompt, fix timestamp fallback

- Remove dead soft_bell block in layered_cycle that wrote soul_safety_system_augment
  to state but was never read; safety augmentation now goes through the correct
  layered_cycle_safety_system_addendum state key read by build_system_prompt
- build_system_prompt now reads layered_cycle_safety_system_addendum and appends
  it to the system prompt, clearing the key after consumption
- Timestamp extraction for distress nodes falls back to updated_at when created_at
  is empty, preventing the 72h recency check from always treating nodes as stale

chat.el

@@ -81,7 +81,15 @@ fn build_system_prompt(ctx: String) -> String {
         "\n\n[ENGRAM CONTEXT — compiled from your graph]\n" + ctx
     }
 
-    return identity + date_line + voice_rules + security_rules + identity_block + engram_block
+    let safety_addendum: String = state_get("layered_cycle_safety_system_addendum")
+    let safety_block: String = if str_eq(safety_addendum, "") {
+        ""
+    } else {
+        state_set("layered_cycle_safety_system_addendum", "")
+        safety_addendum
+    }
+
+    return identity + date_line + voice_rules + security_rules + identity_block + engram_block + safety_block
 }
 
 fn hist_append(hist: String, role: String, content: String) -> String {
@@ -184,7 +192,8 @@ fn handle_chat(body: String) -> String {
         let cutoff: Int = now_ts - 259200
         let found_recent: Bool = if has_nodes {
             let dn0: String = json_array_get(distress_nodes, 0)
-            let ts0_str: String = json_get(dn0, "created_at")
+            let ts0_raw: String = json_get(dn0, "created_at")
+            let ts0_str: String = if str_eq(ts0_raw, "") { json_get(dn0, "updated_at") } else { ts0_raw }
             let ts0: Int = if str_eq(ts0_str, "") { 0 } else { str_to_int(ts0_str) }
             ts0 > cutoff
         } else { false }