harness: markdown tool bubble (bold names, fenced outputs, --- separator) + streamed reply message; letta: structured tool_call/tool_return events, escaped-key arg extraction; matrix: editText with formatted_body

Fixes included: bubble body off-by-one, reply chunk duplication, use-after-free in escaped-key truncation, fence/header concatenation swallowing headers, Read file_path arg extraction.

👾 Generated with [Letta Code](https://letta.com)

Co-Authored-By: Letta Code <noreply@letta.com>

src/matrix.zig

@@ -355,19 +355,26 @@ pub fn sendText(alloc: std.mem.Allocator, io: Io, token: []const u8, room: []con
 }
 
 /// Edit an existing m.text message in place (m.replace). `orig_event_id` is
-/// the event being replaced; `new_body` is the full replacement text. The
-/// plain-text `body` carries the "* " legacy-edit prefix for old clients.
+/// the event being replaced; `new_body` is the full replacement text
+/// (markdown — rendered via formatted_body, with plain-text fallback).
 pub fn editText(alloc: std.mem.Allocator, io: Io, token: []const u8, room: []const u8, orig_event_id: []const u8, new_body: []const u8) ![]u8 {
     const ts = Io.Clock.now(.real, io).nanoseconds;
     const url = try std.fmt.allocPrint(alloc, "{s}/_matrix/client/v3/rooms/{s}/send/m.room.message/infr-edit-{d}", .{ HOMESERVER, room, ts });
     defer alloc.free(url);
 
+    const html = markdownToHtml(alloc, new_body) catch |e| switch (e) {
+        error.OutOfMemory => return e,
+    };
+    defer alloc.free(html);
+
     var payload: std.ArrayList(u8) = .empty;
     defer payload.deinit(alloc);
     try payload.appendSlice(alloc, "{\"msgtype\":\"m.text\",\"body\":\"* ");
     try jsonEscape(alloc, &payload, new_body);
     try payload.appendSlice(alloc, "\",\"m.new_content\":{\"msgtype\":\"m.text\",\"body\":\"");
     try jsonEscape(alloc, &payload, new_body);
+    try payload.appendSlice(alloc, "\",\"format\":\"org.matrix.custom.html\",\"formatted_body\":\"");
+    try jsonEscape(alloc, &payload, html);
     try payload.appendSlice(alloc, "\"},\"m.relates_to\":{\"rel_type\":\"m.replace\",\"event_id\":\"");
     try jsonEscape(alloc, &payload, orig_event_id);
     try payload.appendSlice(alloc, "\"}}");