fix(tests): lnd.newaddress settle window for the post-cascade unlock race

Gate test 24 probed lnd.newaddress moments after the bitcoin bounce
cascade-restarted lnd; the auto-unlocker was still retrying against a
starting gRPC, so the probe saw LND_WALLET_LOCKED on a node that unlocks
itself seconds later (verified on .228 — same request succeeds post-run).
Treat WALLET_LOCKED as settling with a bounded 120s retry, mirroring the
e21f3baf settle window for tests 123/124; every other error still fails
fast, and a genuinely stuck-locked wallet still fails after the window.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/lifecycle/bats/bitcoin-receive.bats

@@ -71,12 +71,21 @@ _lnd_running() {
 @test "lnd.newaddress returns a bech32 address when lnd is running" {
   _lnd_running || skip "lnd not running"
 
+  # The bitcoin bounce in bitcoin-knots.bats cascade-restarts lnd (24fd97ed).
+  # After a restart lnd's gRPC comes up seconds before the auto-unlocker gets
+  # through (its UnlockWallet calls log "waiting to start" until then), so
+  # LND_WALLET_LOCKED inside that window is the node settling, not broken —
+  # retry up to 120s. Any other error, or a wallet still locked after the
+  # window, fails immediately below.
+  local deadline=$((SECONDS + 120)) err addr
+  while :; do
     run rpc_call lnd.newaddress
     [ "$status" -eq 0 ]
-
-  local err addr
     err=$(echo "$output" | jq -r '.error.message // .error // empty')
     addr=$(echo "$output" | jq -r '.result.address // empty')
+    [[ "$err" == *LND_WALLET_LOCKED* && $SECONDS -lt $deadline ]] || break
+    sleep 10
+  done
 
   # The whole point of the fix: a running lnd must hand back a real address.
   if [[ -n "$err" ]]; then