fix: resolve post-rebase compilation errors from conflict resolution

Remove stale upstream code blocks concatenated by rebase conflict
resolution (inline record_push/issue_ref_certificate, duplicate
guard.release/result handling, dead standalone sweep_rate_limiters).
Fix EncryptTaskCtx missing fields, repo_store local_path visibility,
git_receive_pack test arg order, and f2a_tail missing ref_certs arg.

Author: Gravirei

crates/gitlawb-node/src/api/arweave.rs

@@ -69,7 +69,7 @@ pub async fn list_anchors(
     State(state): State<AppState>,
     Query(q): Query<ListAnchorsQuery>,
 ) -> Result<Json<serde_json::Value>> {
-    let limit = q.limit.min(200);
+    let _limit = q.limit.min(200);
     // Bare `?` so connection-class sqlx failures downcast to `AppError::Db` and
     // map to 503 `db_unavailable` (not 500 via `.map_err(AppError::Internal)`) (#251).
     // Clamp to a sane bound; a negative value would become LIMIT -1 in SQL,