fix(tui): reset terminal modes on startup and exit

Reset sticky mouse/focus/paste terminal modes before the TUI starts and during graceful shutdown paths so stale tab state from prior crashes cannot poison the next session.

ui-tui/src/entry.tsx

@@ -11,12 +11,17 @@ import { GatewayClient } from './gatewayClient.js'
 import { setupGracefulExit } from './lib/gracefulExit.js'
 import { formatBytes, type HeapDumpResult, performHeapDump } from './lib/memory.js'
 import { type MemorySnapshot, startMemoryMonitor } from './lib/memoryMonitor.js'
+import { resetTerminalModes } from './lib/terminalModes.js'
 
 if (!process.stdin.isTTY) {
   console.log('hermes-tui: no TTY')
   process.exit(0)
 }
 
+// Start from a clean slate. If a previous TUI crashed or was kill -9'd, the
+// terminal tab can still have mouse/focus/paste modes enabled.
+resetTerminalModes()
+
 const gw = new GatewayClient()
 
 gw.start()
@@ -25,17 +30,27 @@ const dumpNotice = (snap: MemorySnapshot, dump: HeapDumpResult | null) =>
   `hermes-tui: ${snap.level} memory (${formatBytes(snap.heapUsed)}) — auto heap dump → ${dump?.heapPath ?? '(failed)'}\n`
 
 setupGracefulExit({
-  cleanups: [() => gw.kill()],
+  cleanups: [
+    () => {
+      resetTerminalModes()
+
+      return gw.kill()
+    }
+  ],
   onError: (scope, err) => {
     const message = err instanceof Error ? `${err.name}: ${err.message}` : String(err)
 
     process.stderr.write(`hermes-tui ${scope}: ${message.slice(0, 2000)}\n`)
   },
-  onSignal: signal => process.stderr.write(`hermes-tui: received ${signal}\n`)
+  onSignal: signal => {
+    resetTerminalModes()
+    process.stderr.write(`hermes-tui: received ${signal}\n`)
+  }
 })
 
 const stopMemoryMonitor = startMemoryMonitor({
   onCritical: (snap, dump) => {
+    resetTerminalModes()
     process.stderr.write(dumpNotice(snap, dump))
     process.stderr.write('hermes-tui: exiting to avoid OOM; restart to recover\n')
     process.exit(137)