feat(03-02): integrate hook server into daemon with graceful degradation and dynamic poll

- Add hookPort, httpServer, lastHookTime, mu to Daemon struct
- startHookServer binds HTTP on hookPort, degrades if port busy
- Stop() closes httpServer before unix listener
- pollLoop uses time.After(currentPollInterval()) instead of fixed ticker
- currentPollInterval returns 20s when hooks active (<60s), 5s otherwise
- processHookEvent records lastHookTime on each hook event

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

daemon.go

@@ -3,7 +3,9 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+	"log"
 	"net"
+	"net/http"
 	"os"
 	"path/filepath"
 	"sync"
@@ -155,6 +157,10 @@ type Daemon struct {
 	pollInterval      time.Duration
 	stopCh            chan struct{}
 	listener          net.Listener
+	hookPort          int
+	httpServer        *http.Server
+	lastHookTime      time.Time
+	mu                sync.Mutex // protects lastHookTime
 }
 
 // NewDaemon creates a daemon ready to start.
@@ -167,6 +173,7 @@ func NewDaemon(sockPath, procDir, claudeDir string, labels *LabelStore) *Daemon
 		claudeDir:    claudeDir,
 		pollInterval: 5 * time.Second,
 		stopCh:       make(chan struct{}),
+		hookPort:     3119,
 	}
 }
 
@@ -185,12 +192,60 @@ func (d *Daemon) InitWorkspaceResolver(treeProvider I3TreeProvider, x11 X11PIDRe
 	}
 }
 
-// Start runs the daemon: initial scan, then listens on the Unix socket
+// startHookServer starts an HTTP server on hookPort to receive Claude Code hooks.
+// If the port is busy, logs a warning and returns nil (graceful degradation).
+func (d *Daemon) startHookServer() error {
+	if d.hookPort == 0 {
+		return nil
+	}
+
+	addr := fmt.Sprintf("127.0.0.1:%d", d.hookPort)
+
+	mux := http.NewServeMux()
+	mux.HandleFunc("/hook", d.handleHook)
+
+	d.httpServer = &http.Server{
+		Addr:         addr,
+		Handler:      mux,
+		ReadTimeout:  5 * time.Second,
+		WriteTimeout: 5 * time.Second,
+	}
+
+	ln, err := net.Listen("tcp", addr)
+	if err != nil {
+		log.Printf("hook server: port %d busy, continuing without hooks: %v", d.hookPort, err)
+		d.httpServer = nil
+		return nil
+	}
+
+	go d.httpServer.Serve(ln)
+	return nil
+}
+
+// currentPollInterval returns 20s when hooks are active (last hook < 60s ago),
+// 5s otherwise.
+func (d *Daemon) currentPollInterval() time.Duration {
+	d.mu.Lock()
+	lastHook := d.lastHookTime
+	d.mu.Unlock()
+
+	if !lastHook.IsZero() && time.Since(lastHook) < 60*time.Second {
+		return 20 * time.Second
+	}
+	return 5 * time.Second
+}
+
+// Start runs the daemon: initial scan, hook server, then listens on the Unix socket
 // and polls for sessions in the background.
 func (d *Daemon) Start() error {
 	// Synchronous initial scan before accepting connections
 	d.scanOnce(time.Now())
 
+	// Start hook server (graceful degradation if port busy)
+	if err := d.startHookServer(); err != nil {
+		return fmt.Errorf("start hook server: %w", err)
+	}
+
 	if err := d.cleanStaleSocket(); err != nil {
 		return fmt.Errorf("clean stale socket: %w", err)
 	}
@@ -218,6 +273,9 @@ func (d *Daemon) Stop() {
 	default:
 		close(d.stopCh)
 	}
+	if d.httpServer != nil {
+		d.httpServer.Close()
+	}
 	if d.listener != nil {
 		d.listener.Close()
 	}
@@ -244,14 +302,11 @@ func (d *Daemon) acceptLoop() {
 }
 
 func (d *Daemon) pollLoop() {
-	ticker := time.NewTicker(d.pollInterval)
-	defer ticker.Stop()
-
 	for {
 		select {
 		case <-d.stopCh:
 			return
-		case t := <-ticker.C:
+		case t := <-time.After(d.currentPollInterval()):
 			d.scanOnce(t)
 		}
 	}

hook.go

@@ -71,6 +71,10 @@ func (d *Daemon) processHookEvent(event HookEvent) {
 	}
 
 	d.registry.UpdateFromHook(event.SessionID, state, waitType, event.Cwd)
+
+	d.mu.Lock()
+	d.lastHookTime = time.Now()
+	d.mu.Unlock()
 }
 
 // UpdateFromHook updates a session from a hook event.