GeezerVison

chore(core): track v0.1.8 (#31)

Move the core pin from `v0.1.8-pre.5` to `v0.1.8` (stable).

- Core changes:
[v0.1.8-pre.5...v0.1.8](NVIDIA/OpenShell@v0.1.8-pre.5...v0.1.8)
- Regenerated bindings: no generated files changed
- E2E runs against `ghcr.io/nvidia/openshell/gateway:0.1.8`
- Files copied from core:
  - none changed

## Proto changes

No changes under `proto/` between `v0.1.8-pre.5` and `v0.1.8`.

## Before merging

- CI and E2E must pass. If the SDK needs changes for this core version,
push them to this branch.
- Pre-release pins are not released; a newer pre-release proposal
replaces this one.

Signed-off-by: ai-openshell-sdk-python[bot] <354503561+ai-openshell-sdk-python[bot]@users.noreply.github.com>
Co-authored-by: ai-openshell-sdk-python[bot] <354503561+ai-openshell-sdk-python[bot]@users.noreply.github.com>