Snapshot task worktrees to hidden refs as agents work

internal/agents/manager.go

@@ -51,6 +51,9 @@ type Manager struct {
 	deliverMu sync.Mutex
 	capMu     sync.Mutex
 
+	snapMu sync.Mutex
+	snaps  map[string]*snapState
+
 	bad       *badLines
 	watchStop chan struct{}
 }
@@ -85,6 +88,7 @@ func New(st *store.Store, limits Limits, worktreeRoot string) *Manager {
 		live:         map[string]*live{},
 		rateLimits:   map[api.AgentSessionVendor]map[string]any{},
 		merges:       map[string]string{},
+		snaps:        map[string]*snapState{},
 		bad:          newBadLines(),
 		watchStop:    make(chan struct{}),
 	}
@@ -565,6 +569,7 @@ func (m *Manager) ensureLive(ctx context.Context, sess api.AgentSession, task ap
 		Hooks: map[string][]claude.HookMatcher{
 			"UserPromptSubmit": {{Func: remindGuidance}},
 			"Stop":             {{Func: m.bounceProseQuestion(l)}},
+			"PostToolUse":      {{Func: m.snapshotAfterTool(l)}},
 		},
 		OnBadLine: func(line []byte, reason string) { m.recordBadLine(l, line, reason) },
 	}
@@ -588,6 +593,7 @@ func (m *Manager) ensureLive(ctx context.Context, sess api.AgentSession, task ap
 
 	m.live[sess.Id] = l
 	go m.pump(l)
+	go m.snapshotTimer(l)
 	return l, nil
 }
 
@@ -712,6 +718,7 @@ func (m *Manager) handle(ctx context.Context, l *live, ev claude.Event) error {
 		if sha != "" {
 			payload["commit"] = sha
 		}
+		m.snapshotSoon(l, api.SnapshotTriggerTurnEnd)
 		switch {
 		case handoff:
 			payload["handoff"] = true