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/store/ack.go

@@ -0,0 +1,71 @@
+package store
+
+import (
+	"context"
+	"fmt"
+	"time"
+)
+
+// WasAcked returns true when the rule has no pending (un-acked) telegram
+// nudges. A resolved nudge (acted/snoozed/ignored) means the user has seen
+// and dealt with it — the alarm is considered acked.
+func (s *Store) WasAcked(ctx context.Context, key string) (bool, error) {
+	var n int
+	err := s.db.QueryRowContext(ctx,
+		`SELECT COUNT(*) FROM nudges
+		  WHERE rule = ? AND channel = 'telegram' AND outcome = 'pending'`, key).Scan(&n)
+	if err != nil {
+		return false, fmt.Errorf("was acked %s: %w", key, err)
+	}
+	return n == 0, nil
+}
+
+// MarkSent records that a sev4 telegram nudge was sent (or re-sent) for the
+// given rule at the given time. Used by the repeat-til-ack loop to clock the
+// repeat interval.
+func (s *Store) MarkSent(ctx context.Context, key string, ts time.Time) error {
+	_, err := s.db.ExecContext(ctx,
+		`INSERT INTO ack_sends (rule, sent_at) VALUES (?, ?)`,
+		key, ts.UnixMilli())
+	if err != nil {
+		return fmt.Errorf("mark sent %s: %w", key, err)
+	}
+	return nil
+}
+
+// LastSent returns the most recent send timestamp for the given rule's
+// telegram nudge. Returns zero time if nothing has been sent yet (the initial
+// send goes through RecordNudge, not MarkSent, so the first MarkSent comes on
+// the repeat path — LastSent may legitimately be zero until then).
+func (s *Store) LastSent(ctx context.Context, key string) (time.Time, error) {
+	var millis int64
+	err := s.db.QueryRowContext(ctx,
+		`SELECT MAX(sent_at) FROM ack_sends WHERE rule = ?`, key).Scan(&millis)
+	if err != nil {
+		return time.Time{}, fmt.Errorf("last sent %s: %w", key, err)
+	}
+	if millis == 0 {
+		return time.Time{}, nil
+	}
+	return time.UnixMilli(millis).UTC(), nil
+}
+
+// MarkAcked marks ALL pending telegram nudges for the rule as "acted" —
+// stopping the repeat-til-ack loop. Called when the user acknowledges the
+// alarm (voice acknowledgment, Telegram callback, etc.).
+func (s *Store) MarkAcked(ctx context.Context, key string) error {
+	now := time.Now()
+	res, err := s.db.ExecContext(ctx,
+		`UPDATE nudges SET outcome = 'acted', outcome_ts = ?
+		  WHERE rule = ? AND channel = 'telegram' AND outcome = 'pending'`,
+		now.UnixMilli(), key)
+	if err != nil {
+		return fmt.Errorf("mark acked %s: %w", key, err)
+	}
+	n, _ := res.RowsAffected()
+	if n == 0 {
+		// no pending nudges — already acked or never sent; not an error.
+		return nil
+	}
+	return nil
+}