feat: IPC additions for reminders/events/routines, ack tracking, tool management

- Extend IPC wire protocol: add ListReminders, ListEvents, ListProposedRoutines,
  DismissProposedRoutine, AcceptProposedRoutine IPC methods with request/response
  types. Update wire.go with new message kinds.
- Add ack_sends table (migration #5): tracks sev4 telegram repeat-til-ack
  delivery state with rule name + timestamp, indexed for dedup.
- Add Store.DeleteTool: permanently removes a tool row (for dismissing proposed
  tools), idempotent on missing tool.
- Update tick.go: wire new IPC handlers into daemon tick.

internal/ipc/ipc_test.go

@@ -375,6 +375,131 @@ func TestCaller_Peercred(t *testing.T) {
 	}
 }
 
+// TestChatViaClient — Chat round-trips over the wire. Uses a custom CoreAPI
+// that implements Chat (storeAPI returns an error for it).
+func TestChatViaClient(t *testing.T) {
+	dir := t.TempDir()
+	sock := filepath.Join(dir, "maven.sock")
+	chatAPI := &chatTestAPI{}
+	srv, err := Listen(sock, chatAPI)
+	if err != nil {
+		t.Fatalf("listen: %v", err)
+	}
+	done := make(chan struct{})
+	go func() {
+		_ = srv.Serve()
+		close(done)
+	}()
+	t.Cleanup(func() {
+		_ = srv.Close()
+		<-done
+	})
+	cli, err := Dial(srv.Path())
+	if err != nil {
+		t.Fatalf("dial: %v", err)
+	}
+	t.Cleanup(func() { _ = cli.Close() })
+
+	reply, err := cli.Chat(context.Background(), "привет")
+	if err != nil {
+		t.Fatalf("Chat: %v", err)
+	}
+	if reply != "и тебе привет!" {
+		t.Fatalf("Chat = %q, want %q", reply, "и тебе привет!")
+	}
+}
+
+// chatTestAPI — a minimal CoreAPI that only implements Chat for testing.
+type chatTestAPI struct{}
+
+func (a *chatTestAPI) WriteFact(ctx context.Context, req WriteFactReq) (int64, error) {
+	return 0, ErrUnknownMethod
+}
+func (a *chatTestAPI) LatestFact(ctx context.Context, key string) (Fact, error) {
+	return Fact{}, ErrUnknownMethod
+}
+func (a *chatTestAPI) LatestFactBySource(ctx context.Context, key, source string) (Fact, error) {
+	return Fact{}, ErrUnknownMethod
+}
+func (a *chatTestAPI) Since(ctx context.Context, key string, now time.Time) (time.Duration, error) {
+	return 0, ErrUnknownMethod
+}
+func (a *chatTestAPI) Presence(ctx context.Context) (Presence, error) {
+	return Presence{}, ErrUnknownMethod
+}
+func (a *chatTestAPI) CreateReminder(ctx context.Context, fire time.Time, payload, cron string) (int64, error) {
+	return 0, ErrUnknownMethod
+}
+func (a *chatTestAPI) MarkReminder(ctx context.Context, id int64, status string) error {
+	return ErrUnknownMethod
+}
+func (a *chatTestAPI) ListReminders(ctx context.Context, n int) ([]Reminder, error) {
+	return nil, ErrUnknownMethod
+}
+func (a *chatTestAPI) RecordNudge(ctx context.Context, rule, channel, message string, ts time.Time) (int64, error) {
+	return 0, ErrUnknownMethod
+}
+func (a *chatTestAPI) ResolveNudge(ctx context.Context, id int64, outcome string, ts time.Time) error {
+	return ErrUnknownMethod
+}
+func (a *chatTestAPI) RecentOutcomes(ctx context.Context, rule string, n int) ([]string, error) {
+	return nil, ErrUnknownMethod
+}
+func (a *chatTestAPI) RecentFacts(ctx context.Context, n int) ([]Fact, error) {
+	return nil, ErrUnknownMethod
+}
+func (a *chatTestAPI) CalendarEvents(ctx context.Context, from, to time.Time) ([]Fact, error) {
+	return nil, ErrUnknownMethod
+}
+func (a *chatTestAPI) RecentNudges(ctx context.Context, n int) ([]Nudge, error) {
+	return nil, ErrUnknownMethod
+}
+func (a *chatTestAPI) WriteNote(ctx context.Context, ts time.Time, text string, embedding []float32, source string) (int64, error) {
+	return 0, ErrUnknownMethod
+}
+func (a *chatTestAPI) QueryNotes(ctx context.Context, embedding []float32, k int) ([]Note, error) {
+	return nil, ErrUnknownMethod
+}
+func (a *chatTestAPI) RecentNotes(ctx context.Context, n int) ([]Note, error) {
+	return nil, ErrUnknownMethod
+}
+func (a *chatTestAPI) ProposeTool(ctx context.Context, name, utterance, scope string, ts time.Time) (bool, error) {
+	return false, ErrUnknownMethod
+}
+func (a *chatTestAPI) EnableTool(ctx context.Context, name string, cmd []string, destructive bool, scope string, ts time.Time) error {
+	return ErrUnknownMethod
+}
+func (a *chatTestAPI) DisableTool(ctx context.Context, name string) error {
+	return ErrUnknownMethod
+}
+func (a *chatTestAPI) DeleteTool(ctx context.Context, name string) error {
+	return ErrUnknownMethod
+}
+func (a *chatTestAPI) ListProposedRoutines(ctx context.Context) ([]ProposedRoutine, error) {
+	return nil, ErrUnknownMethod
+}
+func (a *chatTestAPI) DismissProposedRoutine(ctx context.Context, id int64) error {
+	return ErrUnknownMethod
+}
+func (a *chatTestAPI) LookupTool(ctx context.Context, name string) (Tool, error) {
+	return Tool{}, ErrUnknownMethod
+}
+func (a *chatTestAPI) ListTools(ctx context.Context, status string) ([]Tool, error) {
+	return nil, ErrUnknownMethod
+}
+func (a *chatTestAPI) RevertFact(ctx context.Context, key string) (int64, error) {
+	return 0, ErrUnknownMethod
+}
+func (a *chatTestAPI) TickTrace(ctx context.Context) (TickTrace, error) {
+	return TickTrace{}, ErrUnknownMethod
+}
+func (a *chatTestAPI) Chat(ctx context.Context, text string) (string, error) {
+	if text == "привет" {
+		return "и тебе привет!", nil
+	}
+	return "поговорили.", nil
+}
+
 // TestDispatch_UnknownMethod — an unknown method over the wire comes back as
 // ErrUnknownMethod, not a panic or a dropped conn. The server must stay up
 // for the next (legitimate) request on the same conn.