feat: add OpenAI/Anthropic tools support with tool emulation

- Parse tools/tool_choice from OpenAI and Anthropic requests
- Inject tool definitions into system prompt via toolemulation
- Parse action blocks (```json action) from model responses
- Retry logic for forced tool_choice (any/required)
- Return proper tool_calls / tool_use in responses
- Support streaming tools via collect-and-replay pattern
- Add tool history projection (assistant tool_calls + tool results)
- Model ID normalization: use official names (Qwen3.6-Plus, etc.)
- Fix resolveSessionMode to use Fresh mode when tools present

internal/lingmaipc/pipe_windows.go

@@ -0,0 +1,57 @@
+//go:build windows
+
+package lingmaipc
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"sync"
+
+	winio "github.com/Microsoft/go-winio"
+)
+
+type pipeTransport struct {
+	path   string
+	conn   net.Conn
+	reader *framedReader
+	write  sync.Mutex
+}
+
+func connectPipeTransport(ctx context.Context, pipePath string) (framedTransport, error) {
+	conn, err := winio.DialPipeContext(ctx, pipePath)
+	if err != nil {
+		return nil, fmt.Errorf("connect Lingma IPC pipe %s: %w", pipePath, err)
+	}
+	return &pipeTransport{
+		path:   pipePath,
+		conn:   conn,
+		reader: newFramedReader(conn),
+	}, nil
+}
+
+func (t *pipeTransport) ReadFrame() ([]byte, error) {
+	return t.reader.ReadFrame()
+}
+
+func (t *pipeTransport) WriteFrame(body []byte) error {
+	t.write.Lock()
+	defer t.write.Unlock()
+
+	frame := []byte(fmt.Sprintf("Content-Length: %d\r\n\r\n", len(body)))
+	if _, err := t.conn.Write(frame); err != nil {
+		return fmt.Errorf("write frame header: %w", err)
+	}
+	if _, err := t.conn.Write(body); err != nil {
+		return fmt.Errorf("write frame body: %w", err)
+	}
+	return nil
+}
+
+func (t *pipeTransport) Close() error {
+	return t.conn.Close()
+}
+
+func (t *pipeTransport) Address() string {
+	return t.path
+}