feat: Add simple chat session for AI agent interaction and enhance message rendering

src/cli/handlers/agent.cc

@@ -12,7 +12,7 @@ namespace agent {
 namespace {
 
 constexpr absl::string_view kUsage =
-  "Usage: agent <run|plan|diff|accept|test|test-conversation|gui|learn|list|commit|revert|describe|resource-list|dungeon-list-sprites|overworld-find-tile|overworld-describe-map|overworld-list-warps|chat> "
+  "Usage: agent <run|plan|diff|accept|test|test-conversation|gui|learn|list|commit|revert|describe|resource-list|dungeon-list-sprites|overworld-find-tile|overworld-describe-map|overworld-list-warps|chat|simple-chat> "
   "[options]";
 
 }  // namespace
@@ -80,6 +80,9 @@ absl::Status Agent::Run(const std::vector<std::string>& arg_vec) {
   if (subcommand == "chat") {
     return agent::HandleChatCommand(rom_);
   }
+  if (subcommand == "simple-chat") {
+    return agent::HandleSimpleChatCommand(subcommand_args, rom_);
+  }
 
   return absl::InvalidArgumentError(std::string(agent::kUsage));
 }

src/cli/handlers/agent/commands.h

@@ -41,6 +41,7 @@ absl::Status HandleOverworldListWarpsCommand(
 	const std::vector<std::string>& arg_vec,
 	Rom* rom_context = nullptr);
 absl::Status HandleChatCommand(Rom& rom);
+absl::Status HandleSimpleChatCommand(const std::vector<std::string>& arg_vec, Rom& rom);
 absl::Status HandleTestConversationCommand(
 	const std::vector<std::string>& arg_vec);
 

src/cli/handlers/agent/general_commands.cc

@@ -26,6 +26,7 @@
 #include "cli/service/ai/gemini_ai_service.h"
 #include "cli/service/ai/ollama_ai_service.h"
 #include "cli/service/ai/service_factory.h"
+#include "cli/service/agent/simple_chat_session.h"
 #include "cli/service/planning/proposal_registry.h"
 #include "cli/service/planning/tile16_proposal_generator.h"
 #include "cli/service/resources/resource_catalog.h"
@@ -571,6 +572,32 @@ absl::Status HandleChatCommand(Rom& rom) {
   return absl::OkStatus();
 }
 
+absl::Status HandleSimpleChatCommand(const std::vector<std::string>& arg_vec,
+                                     Rom& rom) {
+  RETURN_IF_ERROR(EnsureRomLoaded(rom, "agent simple-chat"));
+  
+  // Parse flags
+  std::optional<std::string> batch_file;
+  for (size_t i = 0; i < arg_vec.size(); ++i) {
+    const std::string& arg = arg_vec[i];
+    if (absl::StartsWith(arg, "--file=")) {
+      batch_file = arg.substr(7);
+    } else if (arg == "--file" && i + 1 < arg_vec.size()) {
+      batch_file = arg_vec[i + 1];
+      ++i;
+    }
+  }
+  
+  SimpleChatSession session;
+  session.SetRomContext(&rom);
+  
+  if (batch_file.has_value()) {
+    return session.RunBatch(*batch_file);
+  } else {
+    return session.RunInteractive();
+  }
+}
+
 absl::Status HandleAcceptCommand(const std::vector<std::string>& arg_vec,
                                  Rom& rom) {
   std::optional<std::string> proposal_id;