chore(native): sync native release b9159

[github-actions]

Automated sync from leehack/llamadart-native release b9159.

Changes:

• Updates hook/build.dart native tag pin.
• Syncs headers from the matching llamadart-native release header bundle.
• Regenerates lib/src/backends/llama_cpp/bindings.dart via ffigen.

Local verification

• flutter pub get
• dart format --output=none --set-exit-if-changed hook/build.dart lib/src/backends/llama_cpp/bindings.dart
• CI-style example dependency bootstrap:
  • (cd example/basic_app && flutter pub get)
  • (cd example/chat_app && flutter pub get)
  • (cd example/llamadart_cli && dart pub get)
  • (cd example/llamadart_server && dart pub get)
  • (cd example/tui_coding_agent && flutter pub get)
• dart analyze hook/build.dart lib/src/backends/llama_cpp/bindings.dart
• dart analyze
• dart test -p vm -j 1 --exclude-tags local-only
• Explicit native smoke: dart test -p vm test/integration/inference_smoke_test.dart

Note: GitHub did not attach pull-request checks immediately after this automation PR was opened by github-actions; the local verification above mirrors the relevant CI gates for this generated native sync.