style: fix lint errors and update test assertions for CI

Fix 9 lint issues (predeclared min shadow, golines, gofmt, gci) and
2 test failures (spawn error message assertions).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pkg/agent/loop.go

@@ -880,12 +880,12 @@ func formatDurationMs(ms int64) string {
 		tenths := (ms % 1000) / 100
 		return fmt.Sprintf("%d.%ds", totalSec, tenths)
 	}
-	min := totalSec / 60
+	mins := totalSec / 60
 	sec := totalSec % 60
 	if sec == 0 {
-		return fmt.Sprintf("%dm", min)
+		return fmt.Sprintf("%dm", mins)
 	}
-	return fmt.Sprintf("%dm%ds", min, sec)
+	return fmt.Sprintf("%dm%ds", mins, sec)
 }
 
 // acquireSessionLock gets or creates a per-session semaphore and acquires it.
@@ -1153,7 +1153,10 @@ func (al *AgentLoop) runAgentLoop(ctx context.Context, agent *AgentInstance, opt
 			)
 			messages = append(messages, providers.Message{
 				Role: "user",
-				Content: fmt.Sprintf("[System] Phase %d is now active. Continue working on the next steps.", agent.ContextBuilder.GetCurrentPhase()),
+				Content: fmt.Sprintf(
+					"[System] Phase %d is now active. Continue working on the next steps.",
+					agent.ContextBuilder.GetCurrentPhase(),
+				),
 			})
 			if len(messages) > 0 {
 				al.lastSystemPrompt.Store(messages[0].Content)
@@ -1240,7 +1243,7 @@ func (al *AgentLoop) runAgentLoop(ctx context.Context, agent *AgentInstance, opt
 		if agent.ContextBuilder.IsCurrentPhaseComplete() {
 			if phaseLoop >= maxPhaseTransitions {
 				logger.WarnCF("agent", "Max phase transitions reached, stopping",
-					map[string]interface{}{"agent_id": agent.ID, "transitions": phaseLoop})
+					map[string]any{"agent_id": agent.ID, "transitions": phaseLoop})
 				break
 			}
 			prev := agent.ContextBuilder.GetCurrentPhase()

pkg/tools/shell.go

@@ -903,7 +903,11 @@ func checkCurlLocalNet(command string) string {
 		}
 		host := u.Hostname()
 		if !isLocalHost(host) {
-			return fmt.Sprintf("Command blocked by safety guard (curl/wget is restricted to localhost and private network; %q is a public address)", host)
+			return fmt.Sprintf(
+				"Command blocked by safety guard "+
+					"(curl/wget is restricted to localhost and private network; %q is a public address)",
+				host,
+			)
 		}
 	}
 	return ""

pkg/tools/spawn.go

@@ -73,7 +73,10 @@ func (t *SpawnTool) SetAllowlistChecker(check func(targetAgentID string) bool) {
 func (t *SpawnTool) Execute(ctx context.Context, args map[string]any) *ToolResult {
 	task, ok := args["task"].(string)
 	if !ok || strings.TrimSpace(task) == "" {
-		return ErrorResult(`Required parameter "task" (string) is missing. Example: {"task": "describe what you need done", "preset": "scout"}`)
+		return ErrorResult(
+			`Required parameter "task" (string) is missing. ` +
+				`Example: {"task": "describe what you need done", "preset": "scout"}`,
+		)
 	}
 
 	label, _ := args["label"].(string)

pkg/tools/spawn_test.go

@@ -33,8 +33,8 @@ func TestSpawnTool_Execute_EmptyTask(t *testing.T) {
 			if !result.IsError {
 				t.Error("Expected error for invalid task parameter")
 			}
-			if !strings.Contains(result.ForLLM, "task is required") {
-				t.Errorf("Error message should mention 'task is required', got: %s", result.ForLLM)
+			if !strings.Contains(result.ForLLM, `"task"`) {
+				t.Errorf("Error message should mention '\"task\"', got: %s", result.ForLLM)
 			}
 		})
 	}
@@ -73,7 +73,7 @@ func TestSpawnTool_Execute_NilManager(t *testing.T) {
 	if !result.IsError {
 		t.Error("Expected error for nil manager")
 	}
-	if !strings.Contains(result.ForLLM, "Subagent manager not configured") {
-		t.Errorf("Error message should mention manager not configured, got: %s", result.ForLLM)
+	if !strings.Contains(result.ForLLM, "spawn tool is not available") {
+		t.Errorf("Error message should mention spawn tool not available, got: %s", result.ForLLM)
 	}
 }

pkg/tools/subagent.go

@@ -434,8 +434,10 @@ func (t *SubagentTool) SetContext(channel, chatID string) {
 func (t *SubagentTool) Execute(ctx context.Context, args map[string]any) *ToolResult {
 	task, ok := args["task"].(string)
 	if !ok {
-		return ErrorResult(`Required parameter "task" (string) is missing. Example: {"task": "describe what you need done"}`).
-			WithError(fmt.Errorf("task parameter is required"))
+		return ErrorResult(
+			`Required parameter "task" (string) is missing. ` +
+				`Example: {"task": "describe what you need done"}`,
+		).WithError(fmt.Errorf("task parameter is required"))
 	}
 
 	label, _ := args["label"].(string)

pkg/tools/subagent_tool_test.go

@@ -365,7 +365,11 @@ func TestFormatToolStats(t *testing.T) {
 	}{
 		{"empty", map[string]int{}, ""},
 		{"single", map[string]int{"exec": 3}, "exec:3"},
-		{"multiple sorted", map[string]int{"read_file": 5, "exec": 3, "write_file": 1}, "exec:3,read_file:5,write_file:1"},
+		{
+			"multiple sorted",
+			map[string]int{"read_file": 5, "exec": 3, "write_file": 1},
+			"exec:3,read_file:5,write_file:1",
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {