fix(ci): stabilize flaky terminal and SFTP tests

src/main/daemon/terminal-history-incremental-restore.test.ts

@@ -278,14 +278,16 @@ describe('incremental terminal history restore', () => {
     const firstReplay = reader.detectColdRestore(SESSION_ID)
     const secondReplay = reader.detectColdRestore(secondSessionId)
     try {
+      // Drain by yield because awaiting the session that loses the replay-slot race deadlocks.
       await vi.waitFor(() => expect(pendingYields).toHaveLength(1))
-
       pendingYields.shift()!()
-      expect((await firstReplay)?.scrollbackAnsi).toContain('😀second')
+
       await vi.waitFor(() => expect(pendingYields).toHaveLength(1))
-
       pendingYields.shift()!()
-      expect((await secondReplay)?.scrollbackAnsi).toContain('😀second')
+
+      for (const restore of await Promise.all([firstReplay, secondReplay])) {
+        expect(restore?.scrollbackAnsi).toContain('😀second')
+      }
       expect(pendingYields).toHaveLength(0)
     } finally {
       for (const resume of pendingYields.splice(0)) {

src/main/ssh/ssh-connection-sftp-wire.test.ts

@@ -160,7 +160,8 @@ function installSftpHandlers(sftp: SFTPWrapper, backingRoot: string, operations:
 async function startSftpWireServer(backingRoot: string): Promise<SftpWireServer> {
   const operations: string[] = []
   const connections = new Set<Connection>()
-  const hostKey = utils.generateKeyPairSync('ed25519').private
+  // Ed25519 keygen can produce an invalid 31-byte key; ECDSA points always start with 0x04.
+  const hostKey = utils.generateKeyPairSync('ecdsa', { bits: 256 }).private
   const server = new Ssh2Server({ hostKeys: [hostKey] }, (connection) => {
     connections.add(connection)
     connection.on('error', () => {})