fix(2044): add missing runtime/debug import for panic recovery

Adds defer recover() + stack logging to all background goroutines
launched by the workspace handler, channel manager, and scheduler
to prevent a single panic from crashing the server process.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

workspace-server/internal/channels/manager.go

@@ -271,6 +271,11 @@ func (m *Manager) Reload(ctx context.Context) {
 		ch.Config["_channel_id"] = ch.ID
 
 		go func(a ChannelAdapter, c ChannelRow, pCtx context.Context) {
+			defer func() {
+				if r := recover(); r != nil {
+					log.Printf("PANIC recovered in channel polling goroutine: %v", r)
+				}
+			}()
 			if err := a.StartPolling(pCtx, c.Config, m.onInboundMessage); err != nil {
 				log.Printf("Channels: polling error for %s/%s: %v", c.ChannelType, truncID(c.ID), err)
 			}
@@ -354,6 +359,11 @@ func (m *Manager) HandleInbound(ctx context.Context, ch ChannelRow, msg *Inbound
 			typingCtx, typingCancel := context.WithCancel(fireCtx)
 			defer typingCancel()
 			go func() {
+				defer func() {
+					if r := recover(); r != nil {
+						log.Printf("PANIC recovered in typing indicator goroutine: %v", r)
+					}
+				}()
 				typer.SendTyping(ch.Config, msg.ChatID)
 				ticker := time.NewTicker(4 * time.Second)
 				defer ticker.Stop()

workspace-server/internal/handlers/workspace.go

@@ -14,6 +14,7 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
+	"runtime/debug"
 	"strings"
 	"sync"
 	"time"
@@ -113,6 +114,11 @@ func (h *WorkspaceHandler) goAsync(fn func()) {
 	h.asyncWG.Add(1)
 	go func() {
 		defer h.asyncWG.Done()
+		defer func() {
+			if r := recover(); r != nil {
+				log.Printf("PANIC recovered in goAsync goroutine: %v\n%s", r, debug.Stack())
+			}
+		}()
 		fn()
 	}()
 }
@@ -151,6 +157,11 @@ func globalGoAsync(fn func()) {
 	globalAsync.Add(1)
 	go func() {
 		defer globalAsync.Done()
+		defer func() {
+			if r := recover(); r != nil {
+				log.Printf("PANIC recovered in globalGoAsync goroutine: %v\n%s", r, debug.Stack())
+			}
+		}()
 		fn()
 	}()
 }

workspace-server/internal/scheduler/scheduler.go

@@ -199,6 +199,11 @@ func (s *Scheduler) Start(ctx context.Context) {
 	// entry/exit — those are kept as redundant signals but this pulse is the
 	// one that guarantees liveness freshness regardless of tick state.
 	go func() {
+		defer func() {
+			if r := recover(); r != nil {
+				log.Printf("PANIC recovered in scheduler heartbeat goroutine: %v", r)
+			}
+		}()
 		pulseTicker := time.NewTicker(10 * time.Second)
 		defer pulseTicker.Stop()
 		for {
@@ -638,6 +643,11 @@ func (s *Scheduler) fireSchedule(ctx context.Context, sched scheduleRow) {
 		summary := s.extractResponseSummary(respBody)
 		if summary != "" {
 			go func(wsID, text string) {
+				defer func() {
+					if r := recover(); r != nil {
+						log.Printf("PANIC recovered in broadcast summary goroutine: %v", r)
+					}
+				}()
 				postCtx, postCancel := context.WithTimeout(context.Background(), 30*time.Second)
 				defer postCancel()
 				s.channels.BroadcastToWorkspaceChannels(postCtx, wsID, text)