Add addUserText helper; update all call sites

Conversation.addUserMessage now takes a []ContentBlock (symmetric with
addAssistantMessage). Introduce a thin addUserText wrapper in agent.zig
for the plain-text case and update every call site in agent.zig and
anthropic_messages_json.zig accordingly.

1 files changed, 10 insertions, 1 deletions

diff --git a/libpanto/src/file_system_jsonl_store.zig b/libpanto/src/file_system_jsonl_store.zig
index c77d7d2..979b35e 100644
--- a/libpanto/src/file_system_jsonl_store.zig
+++ b/libpanto/src/file_system_jsonl_store.zig
@@ -1435,6 +1435,15 @@ fn anStamp() session_mod.WireStamp {
     return .{ .api_style = .anthropic_messages, .base_url = "https://api.anthropic.com", .model = "claude-sonnet-4-20250514" };
 }
 
+/// Test helper: append a single-text user message (see the `addUserMessage`
+/// signature change to a block slice).
+fn addUserText(conv: *conversation_mod.Conversation, text: []const u8) !void {
+    const tb = try conversation_mod.textualBlockFromSlice(conv.allocator, text);
+    var block: conversation_mod.ContentBlock = .{ .Text = tb };
+    errdefer block.deinit(conv.allocator);
+    try conv.addUserMessage(&.{block});
+}
+
 test "newUuidV7: produces 36-char hyphenated string with version 7" {
     const io = testing.io;
     const id = try newUuidV7(testing.allocator, io);
@@ -2058,7 +2067,7 @@ test "FileSystemJSONLStore catalog: create → append → load round-trips" {
     // messages owned here).
     var conv = conversation_mod.Conversation.init(testing.allocator);
     defer conv.deinit();
-    try conv.addUserMessage("ping");
+    try addUserText(&conv, "ping");
     try conv.addAssistantMessage(&.{}, null);
 
     const id: session_store_mod.WireIdentity = .{ .api_style = .openai_chat, .base_url = "u", .model = "m" };