feat(batch5): implement jetstream error helpers and group01 constructors

tools/generate-jetstream-errors.sh

@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+output_file="$repo_root/dotnet/src/ZB.MOM.NatsNet.Server/JetStream/JetStreamErrors.GeneratedConstructors.cs"
+
+simple_methods=(
+  "NewJSAccountResourcesExceededError|AccountResourcesExceeded"
+  "NewJSAtomicPublishContainsDuplicateMessageError|AtomicPublishContainsDuplicateMessage"
+  "NewJSAtomicPublishDisabledError|AtomicPublishDisabled"
+  "NewJSAtomicPublishIncompleteBatchError|AtomicPublishIncompleteBatch"
+  "NewJSAtomicPublishInvalidBatchCommitError|AtomicPublishInvalidBatchCommit"
+  "NewJSAtomicPublishInvalidBatchIDError|AtomicPublishInvalidBatchID"
+  "NewJSAtomicPublishMissingSeqError|AtomicPublishMissingSeq"
+  "NewJSBadRequestError|BadRequest"
+  "NewJSClusterIncompleteError|ClusterIncomplete"
+  "NewJSClusterNotActiveError|ClusterNotActive"
+  "NewJSClusterNotAssignedError|ClusterNotAssigned"
+  "NewJSClusterNotAvailError|ClusterNotAvail"
+  "NewJSClusterNotLeaderError|ClusterNotLeader"
+  "NewJSClusterPeerNotMemberError|ClusterPeerNotMember"
+)
+
+templated_methods=(
+  "NewJSAtomicPublishTooLargeBatchError|object?|size|AtomicPublishTooLargeBatch|{size}"
+  "NewJSAtomicPublishUnsupportedHeaderBatchError|object?|header|AtomicPublishUnsupportedHeaderBatch|{header}"
+  "NewJSClusterNoPeersError|Exception|err|ClusterNoPeers|{err}"
+)
+
+{
+  cat <<'EOF'
+// Copyright 2020-2026 The NATS Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+//
+// Generated constructor surface for JetStream API errors.
+// Source parity: server/jetstream_errors_generated.go
+
+namespace ZB.MOM.NatsNet.Server;
+
+public static partial class JsApiErrors
+{
+EOF
+
+  for entry in "${simple_methods[@]}"; do
+    IFS='|' read -r method field <<<"$entry"
+    cat <<EOF
+    public static JsApiError ${method}(params ErrorOption[] opts)
+    {
+        if (ParseOpts(opts) is JsApiError overridden)
+            return Clone(overridden);
+
+        return Clone(${field});
+    }
+
+EOF
+  done
+
+  for entry in "${templated_methods[@]}"; do
+    IFS='|' read -r method arg_type arg_name field placeholder <<<"$entry"
+    cat <<EOF
+    public static JsApiError ${method}(${arg_type} ${arg_name}, params ErrorOption[] opts)
+    {
+        if (ParseOpts(opts) is JsApiError overridden)
+            return Clone(overridden);
+
+        return NewWithTags(${field}, "${placeholder}", ${arg_name});
+    }
+
+EOF
+  done
+
+  cat <<'EOF'
+}
+EOF
+} >"$output_file"
+
+echo "Generated $output_file"