feat(rpc): add nu_listValidators endpoint

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,6 +7,11 @@ Format: [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)
 
 ## [Unreleased]
 
+## [0.9.0] — 2026-04-24
+
+### Added
+- `nu_listValidators` RPC handler — tüm validatörleri döner; `params[0] = true` ile yalnızca aktifler filtrelenir
+
 ## [0.8.0] — 2026-04-24
 
 ### Added

crates/nu-rpc/src/handlers.rs

@@ -14,6 +14,7 @@ pub async fn dispatch(req: JsonRpcRequest, state: &AppState) -> JsonRpcResponse
         "nu_sendRawTx"        => handle_send_raw_tx(&req, state).await,
         "nu_getBlock"         => handle_get_block(&req, state).await,
         "nu_getValidator"     => handle_get_validator(&req, state).await,
+        "nu_listValidators"   => handle_list_validators(&req, state).await,
         "nu_getTx"            => not_implemented(&req, "nu_getTx"),
         "nu_getStory"         => not_implemented(&req, "nu_getStory"),
         "nu_getNode"          => not_implemented(&req, "nu_getNode"),
@@ -126,6 +127,16 @@ async fn handle_get_validator(req: &JsonRpcRequest, state: &AppState) -> JsonRpc
     }
 }
 
+async fn handle_list_validators(req: &JsonRpcRequest, state: &AppState) -> JsonRpcResponse {
+    let only_active = req.params.get(0).and_then(|v| v.as_bool()).unwrap_or(false);
+    let db = state.db.lock().await;
+    let mut validators: Vec<ValidatorState> = db.scan_prefix("validator:");
+    if only_active {
+        validators.retain(|v| v.is_active);
+    }
+    JsonRpcResponse::ok(req.id.clone(), serde_json::to_value(validators).unwrap())
+}
+
 fn not_implemented(req: &JsonRpcRequest, method: &str) -> JsonRpcResponse {
     JsonRpcResponse::err(req.id.clone(), -32000, format!("{method} not implemented yet"))
 }