feat: resolve overlap between stateless and merkletree feature flags (#329)

- Resolved overlap between stateless and merkletree feature flags.
- Updated every testcase related to stateless feature.
- Added compile-time feature check to avoid feature overlap.
- Added --no-default-features for all builds in nightly-release.yml
[(tested)](https://github.com/vacp2p/zerokit/actions/runs/16525062203).

---------

Co-authored-by: Ekaterina Broslavskaya <seemenkina@gmail.com>

rln-wasm/Cargo.toml

@@ -10,7 +10,6 @@ crate-type = ["cdylib", "rlib"]
 [dependencies]
 rln = { path = "../rln", version = "0.8.0", default-features = false, features = [
     "stateless",
-    "fullmerkletree",
 ] }
 zerokit_utils = { path = "../utils", version = "0.6.0", default-features = false }
 num-bigint = { version = "0.4.6", default-features = false }

rln-wasm/tests/browser.rs

@@ -4,8 +4,7 @@
 mod tests {
     use js_sys::{BigInt as JsBigInt, Date, Object, Uint8Array};
     use rln::circuit::{Fr, TEST_TREE_HEIGHT};
-    use rln::hashers::{hash_to_field, poseidon_hash};
-    use rln::poseidon_tree::PoseidonTree;
+    use rln::hashers::{hash_to_field, poseidon_hash, PoseidonHash};
     use rln::protocol::{prepare_verify_input, rln_witness_from_values, serialize_witness};
     use rln::utils::{bytes_le_to_fr, fr_to_bytes_le, IdSecret};
     use rln_wasm::{
@@ -14,7 +13,9 @@ mod tests {
     };
     use wasm_bindgen::{prelude::wasm_bindgen, JsValue};
     use wasm_bindgen_test::{console_log, wasm_bindgen_test, wasm_bindgen_test_configure};
-    use zerokit_utils::merkle_tree::merkle_tree::ZerokitMerkleTree;
+    use zerokit_utils::{
+        OptimalMerkleProof, OptimalMerkleTree, ZerokitMerkleProof, ZerokitMerkleTree,
+    };
 
     #[cfg(feature = "parallel")]
     use {rln_wasm::init_thread_pool, wasm_bindgen_futures::JsFuture, web_sys::window};
@@ -106,7 +107,8 @@ mod tests {
 
         // Create RLN instance for other benchmarks
         let rln_instance = wasm_new(zkey).expect("Failed to create RLN instance");
-        let mut tree = PoseidonTree::default(TEST_TREE_HEIGHT).expect("Failed to create tree");
+        let mut tree: OptimalMerkleTree<PoseidonHash> =
+            OptimalMerkleTree::default(TEST_TREE_HEIGHT).expect("Failed to create tree");
 
         // Benchmark wasm_key_gen
         let start_wasm_key_gen = Date::now();
@@ -137,13 +139,14 @@ mod tests {
         let signal: [u8; 32] = [0; 32];
         let x = hash_to_field(&signal);
 
-        let merkle_proof = tree
+        let merkle_proof: OptimalMerkleProof<PoseidonHash> = tree
             .proof(identity_index)
             .expect("Failed to generate merkle proof");
 
         let rln_witness = rln_witness_from_values(
             identity_secret_hash,
-            &merkle_proof,
+            merkle_proof.get_path_elements(),
+            merkle_proof.get_path_index(),
             x,
             external_nullifier,
             user_message_limit,

rln-wasm/tests/node.rs

@@ -5,8 +5,7 @@
 mod tests {
     use js_sys::{BigInt as JsBigInt, Date, Object, Uint8Array};
     use rln::circuit::{Fr, TEST_TREE_HEIGHT};
-    use rln::hashers::{hash_to_field, poseidon_hash};
-    use rln::poseidon_tree::PoseidonTree;
+    use rln::hashers::{hash_to_field, poseidon_hash, PoseidonHash};
     use rln::protocol::{prepare_verify_input, rln_witness_from_values, serialize_witness};
     use rln::utils::{bytes_le_to_fr, fr_to_bytes_le, IdSecret};
     use rln_wasm::{
@@ -15,7 +14,9 @@ mod tests {
     };
     use wasm_bindgen::{prelude::wasm_bindgen, JsValue};
     use wasm_bindgen_test::{console_log, wasm_bindgen_test};
-    use zerokit_utils::merkle_tree::merkle_tree::ZerokitMerkleTree;
+    use zerokit_utils::{
+        OptimalMerkleProof, OptimalMerkleTree, ZerokitMerkleProof, ZerokitMerkleTree,
+    };
 
     #[wasm_bindgen(inline_js = r#"
     const fs = require("fs");
@@ -71,7 +72,8 @@ mod tests {
 
         // Create RLN instance for other benchmarks
         let rln_instance = wasm_new(zkey).expect("Failed to create RLN instance");
-        let mut tree = PoseidonTree::default(TEST_TREE_HEIGHT).expect("Failed to create tree");
+        let mut tree: OptimalMerkleTree<PoseidonHash> =
+            OptimalMerkleTree::default(TEST_TREE_HEIGHT).expect("Failed to create tree");
 
         // Benchmark wasm_key_gen
         let start_wasm_key_gen = Date::now();
@@ -102,13 +104,14 @@ mod tests {
         let signal: [u8; 32] = [0; 32];
         let x = hash_to_field(&signal);
 
-        let merkle_proof = tree
+        let merkle_proof: OptimalMerkleProof<PoseidonHash> = tree
             .proof(identity_index)
             .expect("Failed to generate merkle proof");
 
         let rln_witness = rln_witness_from_values(
             identity_secret_hash,
-            &merkle_proof,
+            merkle_proof.get_path_elements(),
+            merkle_proof.get_path_index(),
             x,
             external_nullifier,
             user_message_limit,