feat(web): ambient line in state envelope + /ambient/snooze

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

internal/web/web.go

@@ -14,6 +14,7 @@ import (
 	"time"
 
 	"keel/internal/harness"
+	"keel/internal/mode"
 	"keel/internal/mode/focus/statemachine"
 	"keel/internal/settings"
 
@@ -28,6 +29,9 @@ type Server struct {
 	h     *harness.Harness
 	bcast *Broadcaster
 
+	ambientLine   func() string
+	ambientSnooze func(time.Duration)
+
 	mu    sync.Mutex
 	timer *time.Timer
 
@@ -77,14 +81,42 @@ func (s *Server) Router() *gin.Engine {
 	r.GET("/settings", s.handleGetSettings)
 	r.POST("/settings", s.handlePostSettings)
 	r.GET("/fs/browse", s.handleBrowse)
+	r.POST("/ambient/snooze", s.handleAmbientSnooze)
 	return r
 }
 
 func (s *Server) stateJSON() string {
-	data, _ := json.Marshal(s.h.State())
+	line := ""
+	if s.ambientLine != nil {
+		line = s.ambientLine()
+	}
+	payload := struct {
+		mode.Envelope
+		Ambient string `json:"ambient"`
+	}{Envelope: s.h.State(), Ambient: line}
+	data, _ := json.Marshal(payload)
 	return string(data)
 }
 
+// SetAmbient injects the ambient sentinel's line accessor and snooze action,
+// wired by main. Called once at startup before serving.
+func (s *Server) SetAmbient(line func() string, snooze func(time.Duration)) {
+	s.ambientLine = line
+	s.ambientSnooze = snooze
+}
+
+// Broadcast pushes the current state envelope to SSE subscribers. Exposed so the
+// ambient sentinel's change signal can refresh the UI alongside harness changes.
+func (s *Server) Broadcast() { s.broadcast() }
+
+// handleAmbientSnooze mutes the ambient coach for an hour.
+func (s *Server) handleAmbientSnooze(c *gin.Context) {
+	if s.ambientSnooze != nil {
+		s.ambientSnooze(time.Hour)
+	}
+	c.Status(http.StatusNoContent)
+}
+
 func (s *Server) broadcast() {
 	s.bcast.Publish(s.stateJSON())
 }