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

cmd/lingma-ipc-proxy/main.go

@@ -10,6 +10,7 @@ import (
 	"os"
 	"os/signal"
 	"path/filepath"
+	"runtime"
 	"strconv"
 	"strings"
 	"syscall"
@@ -88,7 +89,7 @@ func loadConfig() (service.Config, string) {
 		Transport:   lingmaipc.TransportAuto,
 		Cwd:         currentDir(),
 		Mode:        "agent",
-		ShellType:   "powershell",
+		ShellType:   defaultShellType(),
 		SessionMode: service.SessionModeAuto,
 		Timeout:     120 * time.Second,
 	}
@@ -299,3 +300,10 @@ func valueOr(value string, fallback string) string {
 	}
 	return fallback
 }
+
+func defaultShellType() string {
+	if runtime.GOOS == "windows" {
+		return "powershell"
+	}
+	return "zsh"
+}