ELP: two-layer activation pipeline (activate → suppress → reason → generate)

elp-input.el: replace broken engram_search_json with engram_activate_json
as Layer 1. Layer 2 suppress/filter keeps nodes with non-zero salience/
importance. Reason step extracts patient from top activated node content.
ELP grammar realizes the response via generate().

routes.el: add 'elp' event_type to handle_dharma_recv so the studio can
route ELP requests through dharma.

routes.el

@@ -168,6 +168,11 @@ fn handle_dharma_recv(body: String) -> String {
         return handle_chat_as_soul(eff_payload)
     }
 
+    // ELP — Engram Language Protocol: two-layer activation, no LLM
+    if str_eq(eff_event, "elp") {
+        return handle_elp_chat(eff_payload)
+    }
+
     return "{\"error\":\"unknown event_type\",\"event_type\":\"" + eff_event + "\"}"
 }