docs: bring setup and toolchain in line with a finished bootstrap

Initial setup is complete: setup.md opens with a per-section status table and
drops the stale blockers, toolchain.md records that every pin has been exercised
on real work (engine compile + package, Blender/MPFB/Blosm assets, PROJ origin),
and MPFB's load-and-export check moves from pending to verified. Records the one
unexercised path — a fresh checkout — as a v0.1.0 release check.

Docs/toolchain.md

@@ -4,6 +4,8 @@ Pinned versions for this project. Record the exact build string a tool reports,
 
 Audited 2026-11-06, updated 2026-11-07 on the development workstation.
 
+**State:** initial setup is complete. Every pinned tool below has been exercised on real work — the engine compiled game code and packaged a build, Blender/MPFB/Blosm produced committed assets, and QGIS's PROJ produced the project origin. The only unexercised path is a fresh checkout, tracked as a `v0.1.0` release check.
+
 ## Pins
 
 | Component | Pinned | Source | Status |
@@ -11,9 +13,9 @@ Audited 2026-11-06, updated 2026-11-07 on the development workstation.
 | Bazzite | `45.20261105` (Kinoite, `bazzite-dx-nvidia`), kernel `7.2.15-ogc1.1.fc45` | `ujust update` / `rpm-ostree upgrade` | Booted and default. `44.20261026` retained as rollback. |
 | NVIDIA driver | `615.78.08`, open kernel module | Bazzite image | Verified: desktop session renders through the RTX 5070 Ti; Vulkan GPU0 is the RTX 5070 Ti on driver `615.78.08`, conformance `1.4.3.3`. |
 | Unreal Engine | `5.8.4` — CL 58902052, `++UE5+Release-5.8`, promoted build | Epic download | Fully extracted to `/run/media/system/DATA/Engines/UE_5.8.4` (73 GiB on disk). **Validated 2026-11-07:** headless `-NullRHI` smoke test and full editor GUI launch with Vulkan RHI on the RTX 5070 Ti (loader 1.4.350, `VULKAN_SM5`, map check 0 errors). Pin is final. The verified 5.2.0 archive stays as fallback. |
-| Unreal Linux toolchain | system `clang 23.1.4` (Fedora 45) | `rpm-ostree` layer | This 5.8.4 build ships **no** bundled Linux clang (no `clang++` anywhere in the engine tree, verified 2026-11-07); UBT compiles game code with the system toolchain. **Accepted 2026-11-07:** first game-module compile and link succeeded (`GigLineEditor` target, `libUnrealEditor-GigLine.so`). Note: game targets must use `BuildSettingsVersion.V7` to share the engine's build environment. |
+| Unreal Linux toolchain | system `clang 23.1.4` (Fedora 45) | `rpm-ostree` layer | This 5.8.4 build ships **no** bundled Linux clang (no `clang++` anywhere in the engine tree, verified 2026-11-07); UBT compiles game code with the system toolchain. **Accepted 2026-11-07:** game-module compile and link (`GigLineEditor`, `libUnrealEditor-GigLine.so`) and a packaged Development build. Game targets use `BuildSettingsVersion.V7` + `EngineIncludeOrderVersion.Latest` (`Source/GigLine.Target.cs`, `Source/GigLineEditor.Target.cs`) to share the installed editor's build environment. |
 | Blender | `5.2.0` LTS (build 2026-07-14) | Flatpak `org.blender.Blender` | Installed. Run headless from the app tree with `LD_LIBRARY_PATH` + `BLENDER_USER_SCRIPTS`; `flatpak run` is unavailable to the agent shell. |
-| MPFB | `2.0.18` (extension `bl_ext.blender_org.mpfb`, `blender_version_min 4.2.0`) | Blender extensions platform | Installed. **Headless-verified 2026-11-07 on 5.2:** enables and generates a default human (19 158-vert mesh, UVs) via `Tools/addon_compat_probe.py`. Headless runs must set `XDG_CONFIG_HOME=$HOME/.var/app/org.blender.Blender/config` or the extension is not discovered (see `Art/blender/README.md`). Load-and-export (skeleton + baked materials) check still pending. |
+| MPFB | `2.0.18` (extension `bl_ext.blender_org.mpfb`, `blender_version_min 4.2.0`) | Blender extensions platform | Installed. **Fully verified 2026-11-07:** generates a default human (19 158 verts, UVs), standard 137-bone rig with weights, and a baked 1024² skin; the character imports into Unreal as a `SkeletalMesh` with Skeleton, Material, and Texture. Headless runs must set `XDG_CONFIG_HOME=$HOME/.var/app/org.blender.Blender/config` or the extension is not discovered (`Art/blender/README.md`). |
 | Blosm | `2.7.28` (legacy add-on, `bl_info.blender = (4, 5, 0)`, manifest min 4.2) | blosm.com | Installed and importing on Blender 5.2 in `3Dsimple` mode. Two headless workarounds are required; see `Art/blender/README.md`. Paid material asset pack lives in `~/Downloads/blosm-assets/` and is not committed. |
 | QGIS | `4.2.3`, Flatpak `stable`, runtime `org.kde.Platform 6.11`; bundled PROJ `9.9.0` | flathub | Installed 2026-11-06. Stale `lts` branch (`3.28.9`, EOL Qt5 runtime) uninstalled 2026-11-07; only `stable` remains. |
 | Git | `2.56.0` | Bazzite image | Installed. |