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.

elp-input.elh

@@ -0,0 +1,5 @@
+// auto-generated by elc --emit-header - do not edit
+extern fn elp_extract_topic(msg: String) -> String
+extern fn elp_detect_predicate(msg: String) -> String
+extern fn elp_parse(msg: String) -> String
+extern fn handle_elp_chat(body: String) -> String