Fix query kes-period-info hanging indefinitely

getLocalChainTip was called inside executeLocalStateQueryExpr, opening
a second node connection while the state query mux was still active.
The state query thread could not fill its completionVar (and thus close
connection 1) because it was blocked waiting for the second connection
to return. Deadlock.

Fix: use queryChainBlockNo/queryChainPoint within the existing session
and reconstruct ChainTip via makeChainTip — the same pattern used by
runQueryTipCmd.

Fixes: #1434

Author: Jimbo4350

.changes/20260901_fix_kes_period_info_hang.yml

@@ -0,0 +1,5 @@
+project: cardano-cli
+pr: 1435
+kind:
+  - bugfix
+description: Fix `query kes-period-info` hanging indefinitely by replacing `getLocalChainTip` (which opens a second node connection) with `queryChainBlockNo`/`queryChainPoint` state queries within the existing connection.

cardano-cli/src/Cardano/CLI/EraBased/Query/Run.hs

@@ -381,7 +381,9 @@ runQueryKesPeriodInfoCmd
             -- it is equivalent to what we have on disk.
             ptclState <- easyRunQuery (queryProtocolState sbe)
 
-            chainTip <- liftIO $ getLocalChainTip nodeConnInfo
+            mChainBlockNo <- lift queryChainBlockNo & onLeft (left . QueryCmdUnsupportedNtcVersion)
+            mChainPoint <- lift queryChainPoint & onLeft (left . QueryCmdUnsupportedNtcVersion)
+            let chainTip = makeChainTip mChainBlockNo mChainPoint
 
             let curKesPeriod = currentKesPeriod chainTip gParams
                 oCertStartKesPeriod = opCertStartingKesPeriod opCert