fix: session auto-expiry + Ollama thinking suppression

1. Session cleanup: on daemon startup, mark sessions older than 24h as
   completed. Prevents indefinite accumulation of stale sessions.

2. Bump workflow-plugin-agent to v0.6.4: Ollama thinking disabled by
   default (think:false), uses native NumPredict for max tokens.

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

Author: intel352

go.mod

@@ -7,7 +7,7 @@ require (
 	charm.land/bubbletea/v2 v2.0.1
 	charm.land/lipgloss/v2 v2.0.0
 	github.com/GoCodeAlone/workflow v0.3.56
-	github.com/GoCodeAlone/workflow-plugin-agent v0.6.3
+	github.com/GoCodeAlone/workflow-plugin-agent v0.6.4
 	github.com/charmbracelet/glamour v0.10.0
 	github.com/google/generative-ai-go v0.20.1
 	github.com/google/uuid v1.6.0

go.sum

@@ -68,8 +68,8 @@ github.com/GoCodeAlone/modular/modules/scheduler v1.14.0 h1:JSrzo4FB7uGASExv+fCL
 github.com/GoCodeAlone/modular/modules/scheduler v1.14.0/go.mod h1:emkR2AnilabLJZv1rOTDO9eGpRBmZs487H00Lnp9jIc=
 github.com/GoCodeAlone/workflow v0.3.56 h1:jsJmVwCRLz7XOTLQNoyE7POBDW3SmqbG/18VnAzbaEc=
 github.com/GoCodeAlone/workflow v0.3.56/go.mod h1:uATRqpqPubm+g2jJtYoaMTMmjlUaXnLsSdZk5of+jW0=
-github.com/GoCodeAlone/workflow-plugin-agent v0.6.3 h1:oMbDvhR3EFwXiy1Gt04UPvrxzE0JTxKc0m5PXPMc6bY=
-github.com/GoCodeAlone/workflow-plugin-agent v0.6.3/go.mod h1:rUvcW5BpQYVV+QmUjYJJ7BZHa3tmOZqCUuztk/++EJM=
+github.com/GoCodeAlone/workflow-plugin-agent v0.6.4 h1:9DuFAaG2r3XOADa3WQntwS60rTiqKMux+YuXJMJxoeY=
+github.com/GoCodeAlone/workflow-plugin-agent v0.6.4/go.mod h1:rUvcW5BpQYVV+QmUjYJJ7BZHa3tmOZqCUuztk/++EJM=
 github.com/GoCodeAlone/workflow-plugin-authz v0.2.2 h1:xnaNLQybNv4u/TeC1+pJuwUHbLPZaCOtcWcUn4HVeq4=
 github.com/GoCodeAlone/workflow-plugin-authz v0.2.2/go.mod h1:jyeRNdNl8qCXwTc1lGYPazz97ZjCVrE2OGgqGheBJV0=
 github.com/GoCodeAlone/yaegi v0.17.1 h1:aPAwU29L9cGceRAff02c5pjQcT5KapDB4fWFZK9tElE=

internal/daemon/service.go

@@ -55,10 +55,18 @@ func NewService(ctx context.Context) (*Service, error) {
 	if err != nil {
 		return nil, err
 	}
+	sm := NewSessionManager(engine.DB)
+	// Clean up stale sessions from previous daemon runs (24h expiry).
+	if cleaned, err := sm.CleanupStale(ctx, 24*time.Hour); err != nil {
+		log.Printf("session cleanup: %v", err)
+	} else if cleaned > 0 {
+		log.Printf("session cleanup: marked %d stale sessions as completed", cleaned)
+	}
+
 	svc := &Service{
 		startedAt:    time.Now(),
 		engine:       engine,
-		sessions:     NewSessionManager(engine.DB),
+		sessions:     sm,
 		permGate:     newPermissionGate(),
 		approvalGate: NewApprovalGate(),
 		plans:        NewPlanManager(engine.Hooks),

internal/daemon/sessions.go

@@ -123,6 +123,18 @@ func (sm *SessionManager) SetBackground(ctx context.Context, id string) error {
 	return err
 }
 
+// CleanupStale marks sessions older than maxAge as completed.
+// Called on daemon startup to prevent indefinite accumulation.
+func (sm *SessionManager) CleanupStale(ctx context.Context, maxAge time.Duration) (int64, error) {
+	cutoff := time.Now().Add(-maxAge).Format(time.RFC3339)
+	result, err := sm.db.ExecContext(ctx,
+		`UPDATE sessions SET status = 'completed' WHERE status = 'active' AND created_at < ?`, cutoff)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected()
+}
+
 // Subscribe returns a channel for receiving session events.
 func (sm *SessionManager) Subscribe(sessionID string) chan any {
 	ch := make(chan any, 64)