feat(document): decouple shared Office conversion from preview

python/sdk-runtime/src/deepseek_harness_runtime/__init__.py

@@ -57,7 +57,7 @@ def bundled_runtime_path() -> Path:
     """Absolute path of the bundled single-file runtime executable for the current platform.
 
     Raises FileNotFoundError when the platform is unsupported, the executable
-    has not been placed into this package, the required ripgrep sidecar is
+    has not been placed into this package, the ripgrep or Office sidecar is
     missing, or the required macOS spawn helper is missing; the message names
     the acquisition routes (acquisition strategy is deliberately separate from
     this lookup interface, so an on-demand download can replace it without
@@ -88,6 +88,14 @@ def bundled_runtime_path() -> Path:
                 f"deepseek-harness-runtime-bin is missing the node-pty spawn helper at {helper}. "
                 + _EXE_ACQUISITION_HINT
             )
+    office = path.with_name(f"{path.name.removesuffix('.exe')}-office")
+    engine = "wasm" if tag.startswith("linux-") else tag.replace("win-", "win32-").replace("macos-", "darwin-")
+    for required in ("@deepseek-ai/libreoffice-kit/package.json", f"@deepseek-ai/libreoffice-kit-{engine}/prebuilds.json"):
+        if not (office / "node_modules" / required).is_file():
+            raise FileNotFoundError(
+                f"deepseek-harness-runtime-bin is missing the Office sidecar at {office}. "
+                + _EXE_ACQUISITION_HINT
+            )
     return path