feat(native-tools): add native tool calling support for Ollama models

- Add INativeToolCall interface for native tool call format
- Add useNativeToolCalling option to IDualAgentOptions
- Add getToolsAsJsonSchema() to convert tools to Ollama JSON Schema format
- Add parseNativeToolCalls() to convert native tool calls to proposals
- Add startTaskWithNativeTools() and continueWithNativeTools() to DriverAgent
- Update DualAgentOrchestrator to support both XML parsing and native tool calling modes

Native tool calling is more efficient for models like GPT-OSS that use Harmony format,
as it activates Ollama's built-in tool parser instead of requiring XML generation.

ts/smartagent.interfaces.ts

@@ -48,6 +48,12 @@ export interface IDualAgentOptions extends plugins.smartai.ISmartAiOptions {
   logPrefix?: string;
   /** Callback fired for each token during LLM generation (streaming mode) */
   onToken?: (token: string, source: 'driver' | 'guardian') => void;
+  /**
+   * Enable native tool calling mode (default: false)
+   * When enabled, uses Ollama's native tool calling API instead of XML parsing
+   * This is more efficient for models that support it (e.g., GPT-OSS with Harmony format)
+   */
+  useNativeToolCalling?: boolean;
 }
 
 // ================================
@@ -83,6 +89,18 @@ export interface IToolAction {
   parameters: Record<string, unknown>;
 }
 
+/**
+ * Native tool call from provider (matches Ollama's tool calling format)
+ * Format: function name is "toolName_actionName" (e.g., "json_validate")
+ */
+export interface INativeToolCall {
+  function: {
+    name: string;  // Format: "toolName_actionName"
+    arguments: Record<string, unknown>;
+    index?: number;
+  };
+}
+
 /**
  * Proposed tool call from the Driver
  */