fix cross-repo path deps; remove el compiler from neuron-lang/

- neuron-runtime, neuron-store, neuron-migrate: fix path deps
  (products/engram/ → foundation/engram/engrams/, products/el/ → foundation/el/engrams/)
- neuron-rs workspace: fix axon-events/axon-protocol paths
  (../../../platform/ → ../../platform/, paths were off by one level)
- neuron-lang/compiler/ removed (el self-hosting compiler now lives in foundation/el/el-compiler/)

neuron-lang/proxy.el

@@ -0,0 +1,31 @@
+// proxy.el — HTTP proxy helpers.
+
+import "daemon_config.el"
+
+fn proxy_get(target_base: String, path: String, token: String) -> String {
+    let url: String = target_base + path
+    return http_get_auth(url, token)
+}
+
+fn proxy_post(target_base: String, path: String, body: String, token: String) -> String {
+    let url: String = target_base + path
+    return http_post_auth(url, token, body)
+}
+
+fn proxy_request(target_base: String, method: String, path: String, body: String, token: String) -> String {
+    if str_eq(method, "GET") {
+        return proxy_get(target_base, path, token)
+    }
+    if str_eq(method, "POST") {
+        return proxy_post(target_base, path, body, token)
+    }
+    if str_eq(method, "PUT") {
+        let url: String = target_base + path
+        return http_put_auth(url, token, body)
+    }
+    if str_eq(method, "DELETE") {
+        let url: String = target_base + path
+        return http_delete_auth(url, token)
+    }
+    return "{\"error\":\"unsupported method\"}"
+}