OpenClaw: Sandbox dangling-symlink alias handling could bypass workspace-only write boundary

Summary

### Summary A sandbox boundary-validation gap in symlink alias handling allowed certain workspace-only write paths to be treated as in-boundary even when they could resolve outside the workspace/sandbox root.

### Affected Packages / Versions - Package: npm `openclaw` - Affected versions: `<= 2026.2.25` - Latest published npm version included in affected range: `2026.2.25` (checked on February 26, 2026) - Patched version (pre-set for release): `2026.2.26`

### Technical Details In affected versions, dangling symlink hops could be accepted during boundary checks under missing-target conditions. For workspace-only write flows (including `apply_patch`), this could allow writes to resolve outside the configured workspace/sandbox boundary.

The fix resolves symlink targets through existing ancestors and fails closed when canonical resolution escapes the configured boundary.

### Impact - Boundary-confined write operations could be redirected outside the configured workspace/sandbox root. - Primary impact is integrity of host-side files reachable from that path resolution.

### Fix Commit(s) - `4fd29a35bb85a1898ebff518364c467058b50e14`

### Release Process Note `patched_versions` is pre-set to the planned next release (`2026.2.26`) so once npm `2026.2.26` is published, the advisory can be published without further field edits.

Thanks @tdjackey for reporting.