test: increase wallet sync timeout to fix flaky tests

Delete CLAUDE.md

Author: federicociro

docs/release-notes/release-notes-0.20.0.md

@@ -293,9 +293,13 @@ reader of a payment request.
   [removed](https://github.com/lightningnetwork/lnd/pull/9967) meaning that any 
   test network scripts that rely on bootstrapping being disabled will need to 
   explicitly define the `--nobootstrap` flag. Bootstrapping will now also be
-  [deterministic](https://github.com/lightningnetwork/lnd/pull/10003) on local 
+  [deterministic](https://github.com/lightningnetwork/lnd/pull/10003) on local
   test networks so that bootstrapping behaviour can be tested for.
 
+* [Increased wallet sync timeout](https://github.com/lightningnetwork/lnd/pull/10323)
+  in integration tests from 30 seconds to 90 seconds to reduce test flakiness
+  in CI environments, particularly for the neutrino backend wallet sync tests.
+
 ## Database
 
 * Add missing [sql index](https://github.com/lightningnetwork/lnd/pull/10155)

lnwallet/test/test_interface.go

@@ -3009,12 +3009,12 @@ func waitForWalletSync(r *rpctest.Harness, w *lnwallet.LightningWallet) error {
 		bestHash, knownHash     *chainhash.Hash
 		bestHeight, knownHeight int32
 	)
-	timeout := time.After(30 * time.Second)
+	timeout := time.After(90 * time.Second)
 	for !synced {
 		// Do a short wait
 		select {
 		case <-timeout:
-			return errors.New("timeout after 30s")
+			return errors.New("timeout after 90s")
 		case <-time.Tick(100 * time.Millisecond):
 		}