fix(pkg/p2p): replace persistent gater with no-op gater

Stale blocklist entries in the Badger datastore were causing the
edennet-2 incident (#3267): fullnodes rejected every
binary builder peer, header sync never initialized, and nodes fell back
to DA-only sync.

Replace the persistent BasicConnectionGater with a no-op variant:
- Nil datastore → purely in-memory, nothing survives restart
- Removed from libp2p host → no connection-level filtering
- Removed setupBlockedPeers / setupAllowedPeers → nothing ever blocks
- Instance kept only to satisfy go-header's Exchange API requirement

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: auricom

pkg/p2p/client.go

@@ -82,7 +82,11 @@ func NewClient(
 	metrics *Metrics,
 ) (*Client, error) {
 
-	gater, err := conngater.NewBasicConnectionGater(ds)
+	// No-op gater: never persists or blocks any peer. The gater instance is kept
+	// only because go-header's Exchange requires a *conngater.BasicConnectionGater
+	// parameter. libp2p itself is not given this gater, so no connection is ever
+	// filtered at the host level either.
+	gater, err := conngater.NewBasicConnectionGater(nil)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create connection gater: %w", err)
 	}
@@ -156,16 +160,6 @@ func (c *Client) startWithHost(ctx context.Context, h host.Host) error {
 		c.logger.Info().Str("address", fmt.Sprintf("%s/p2p/%s", a, c.host.ID())).Msg("listening on address")
 	}
 
-	c.logger.Debug().Str("blacklist", c.conf.BlockedPeers).Msg("blocking blacklisted peers")
-	if err := c.setupBlockedPeers(c.parseAddrInfoList(c.conf.BlockedPeers)); err != nil {
-		return err
-	}
-
-	c.logger.Debug().Str("whitelist", c.conf.AllowedPeers).Msg("allowing whitelisted peers")
-	if err := c.setupAllowedPeers(c.parseAddrInfoList(c.conf.AllowedPeers)); err != nil {
-		return err
-	}
-
 	c.logger.Debug().Msg("setting up gossiping")
 	if err := c.setupGossiping(ctx); err != nil {
 		return err
@@ -340,7 +334,7 @@ func (c *Client) listen() (host.Host, error) {
 		return nil, err
 	}
 
-	return libp2p.New(libp2p.ListenAddrs(maddr), libp2p.Identity(c.privKey), libp2p.ConnectionGater(c.gater))
+	return libp2p.New(libp2p.ListenAddrs(maddr), libp2p.Identity(c.privKey))
 }
 
 func (c *Client) setupDHT(ctx context.Context) error {