fix(tools): importers clear the read-only LFS bit before saving; 0.1.3 docs refresh (#29)

Merged PR #29: v0.1.3 packaging and setup fixes

Co-authored-by: Zwitschi <zwitschi82@gmail.com>

Tools/README.md

@@ -16,6 +16,7 @@ Geographic tools live in [`Geo/tools/`](../Geo/README.md) and the Blender-side b
 | Tool | Purpose |
 | --- | --- |
 | `check-lfs.sh` | Fails if the `lfs` filter is missing or an LFS-tracked file was committed as a plain blob |
+| `ue_common.py` | Shared helpers for the Unreal commandlet scripts: `make_writable()` clears the read-only bit an LFS `.umap` checks out with (otherwise `save_map()` returns False silently), and `require_saved()` makes that failure explicit. |
 | `fbx_export_preset.py` | The **single** FBX export preset (`ue_metric_v1` / `ue_character_v1`): metres→centimetres via `FBX_SCALE_NONE`, axis mapping east +X / north −Y / up +Z, `mesh_smooth_type="FACE"` (smoothing groups survive the import). Every Blender exporter imports it instead of copying the argument block; `preset_kwargs()` is bpy-free and unit-tested. |
 | `sibling_asset_audit.py` | Reads the sibling project's prop library from GLB headers into `Art/props/reuse-manifest.json`; copies nothing |
 | `scale_test_export.py` / `ue_scale_test_import.py` | The 1 m = 100 uu scale test; the named presets `ue_metric_v1` live in these two files |