fix(server): remove debug logging and add error handling from review

- Remove debug log.Printf calls from handler/daemon.go and service/task.go
  that used the global log package instead of structured logging
- Remove unused truncate() helper from service/task.go
- Add error handling for EnqueueTaskForIssue in createAgentInitIssue
- Clean up verbose debug logging in daemon/daemon.go handleTask
- Add shutdown sequence comment to codex.go lifecycle goroutine

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/internal/handler/agent.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"log"
 	"net/http"
 
 	"github.com/go-chi/chi/v5"
@@ -285,7 +286,9 @@ func (h *Handler) createAgentInitIssue(ctx context.Context, agent db.Agent, crea
 	h.broadcast("issue:created", map[string]any{"issue": issueToResponse(issue)})
 
 	// Enqueue the task directly — we know the agent is assigned and status is "todo".
-	h.TaskService.EnqueueTaskForIssue(ctx, issue)
+	if _, err := h.TaskService.EnqueueTaskForIssue(ctx, issue); err != nil {
+		log.Printf("createAgentInitIssue: enqueue task failed for issue %s: %v", issue.Title, err)
+	}
 }
 
 type UpdateAgentRequest struct {

server/internal/handler/daemon.go

@@ -3,7 +3,6 @@ package handler
 import (
 	"encoding/json"
 	"fmt"
-	"log"
 	"net/http"
 	"strings"
 
@@ -207,17 +206,13 @@ func (h *Handler) CompleteTask(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	log.Printf("[Handler.CompleteTask] task=%s output_len=%d", taskID, len(req.Output))
-
 	result, _ := json.Marshal(req)
 	task, err := h.TaskService.CompleteTask(r.Context(), parseUUID(taskID), result)
 	if err != nil {
-		log.Printf("[Handler.CompleteTask] task=%s error: %v", taskID, err)
 		writeError(w, http.StatusBadRequest, err.Error())
 		return
 	}
 
-	log.Printf("[Handler.CompleteTask] task=%s completed, issue status synced", taskID)
 	writeJSON(w, http.StatusOK, taskToResponse(*task))
 }