docs: add the memory convention and seed MEMORY.md

AGENTS.md now states that planned work is checkbox items in ROADMAP.md marked
open, in progress, or done, and that discoveries, gotchas, notes, and bugs go to
MEMORY.md for coordination between collaborators. MEMORY.md is seeded with what
this build-up actually cost: the Unreal read-only-home crash, Blender/Blosm
headless workarounds and the spherical projection, the tiled-TIFF DEM trap, the
reference licensing and throttling rules, and the LFS silent-blob trap.

Also stages the concurrently created Unreal project files, and stops per-project
Build/ output (FileOpenOrder logs) from entering the repository.

ROADMAP.md

@@ -11,10 +11,10 @@ Workstation and geo pipeline are done and verified. The art pipeline has a first
 | Workstation | Bazzite `45.20261105`, driver `615.78.08`, Vulkan good, `git-lfs`/`clang`/`cmake`/`ninja` installed |
 | Tooling | Blender 5.2 + MPFB 2.0.18 + Blosm 2.7.28 working headless; QGIS 4.2.3; PROJ 9.9.0; Unreal 5.8.4 installed |
 | Geo | extract, address + footprints + bounds, CRS + origin, 3DEP DEM, street profile, cross-sections — all verified and committed |
-| Engine | 5.8.4 extracted, headless `-NullRHI` init passes, Vulkan RHI unproven |
+| Engine | 5.8.4 installed and validated: headless + Vulkan GUI editor launch pass on the RTX 5070 Ti |
 | Blender | blockout (87 meshes), terrain, street (road/kerbs/sidewalks), site assembly — all in one frame, walk-checked |
 | Reference | 72 images local, uncommitted; hero entrance located; inherited eight-step claim overturned |
-| Unreal project | not created — C++ project, packaging, and imports all open |
+| Unreal project | `Game/GigLine` C++ project created; editor target compiles; blank Linux build packaged and launch-tested |
 
 **Open decisions:** code licence (MIT proposed); whether shipped builds carry a derived OSM database (ODbL posture).
 
@@ -26,16 +26,16 @@ Status detail in [Docs/setup.md](Docs/setup.md); workstation audit in [Docs/envi
 
 - [x] Update Bazzite using its supported mechanism; verify NVIDIA driver and Vulkan operation.
 - [x] Register an Epic account and accept the Unreal license; obtain a pinned Linux engine build or build from Epic's authorized source repository.
-- [-] Validate Unreal runs on Bazzite before asset production (not an officially supported distribution). 5.8.4 fully extracted (73 GiB, CL 58902052, promoted build); headless smoke test passed 2026-11-07 (`UnrealEditor-Cmd -nullrhi -run=BlankProgram`, clean startup and shutdown). Editor GUI launch on Vulkan still pending.
-- [-] Install the engine-required compiler/SDK, Git, Git LFS, and an editor; use Distrobox for isolated CLI dependencies where useful. clang 23.1.4 / cmake 4.3.0 / ninja 1.13.2 installed; verified 2026-11-07 that this engine build bundles no Linux clang, so the system compiler is the toolchain — final proof lands with the first C++ project compile.
-- [-] Pin Blender, MPFB, Blosm, and QGIS versions; confirm add-on compatibility; record in `docs/toolchain.md`. Done: Blender 5.2.0 LTS, MPFB 2.0.18, Blosm 2.7.28 (imports headless on 5.2 in `3Dsimple`; two headless workarounds documented), QGIS 4.2.3 with PROJ 9.9.0, stale QGIS `lts` 3.28.9 uninstalled 2026-11-07, Unreal 5.8.4 recorded as pin in `Docs/toolchain.md`. Left: finalize the Unreal pin once the editor GUI launches.
+- [x] Validate Unreal runs on Bazzite before asset production (not an officially supported distribution). 2026-11-07: headless `-NullRHI` smoke test **and** full editor GUI launch with the Vulkan RHI passed — device `NVIDIA GeForce RTX 5070 Ti`, Vulkan loader 1.4.350, `VULKAN_SM5`, map check 0 errors. Only benign log noise (Android Turnkey status, telemetry DNS failures).
+- [x] Install the engine-required compiler/SDK, Git, Git LFS, and an editor; use Distrobox for isolated CLI dependencies where useful. clang 23.1.4 / cmake 4.3.0 / ninja 1.13.2 installed; this engine build bundles no Linux clang, so the system compiler is the toolchain. **Accepted 2026-11-07:** the first C++ game-module compile and link (`libUnrealEditor-GigLine.so`) succeeded with system clang.
+- [x] Pin Blender, MPFB, Blosm, and QGIS versions; confirm add-on compatibility; record in `docs/toolchain.md`. Done: Blender 5.2.0 LTS, MPFB 2.0.18, Blosm 2.7.28, QGIS 4.2.3 with PROJ 9.9.0 (stale `lts` removed 2026-11-07), Unreal 5.8.4 finalized as pin after the editor GUI launch.
 - [x] Create repository structure (`Game/`, `Art/`, `Geo/`, `Tools/`, `Docs/`) with LFS tracking and ignore rules applied.
 - [x] Keep project and Derived Data Cache on SSD storage; reserve several hundred GB for engine, assets, caches, builds.
 
 ### Project bootstrap
 
-- [ ] Create a C++ Unreal project with Blueprint gameplay iteration and Enhanced Input.
-- [ ] Package and launch a blank Linux build.
+- [x] Create a C++ Unreal project with Blueprint gameplay iteration and Enhanced Input. Created 2026-11-07 at `Game/GigLine/GigLine.uproject` (primary game module + default game mode, Enhanced Input plugin + input classes in `Config/DefaultInput.ini`); `GigLineEditor` target compiles clean with system clang (UBT: Result Succeeded).
+- [x] Package and launch a blank Linux build. 2026-11-07: UAT `BuildCookRun` (cook + build + stage + pak, Development config) succeeded in 56 s; 1.1 GiB archive at `/run/media/system/DATA/Builds/GigLine` (outside the repo, uncommitted). `GigLine.sh` launched on the desktop session, created a Vulkan swapchain, and rendered 759 frames across a 60 s test. Known minor: one handled `PSOPrecache` ensure fires at exit only; not blocking, watch it in `0.1.x`.
 - [ ] Export one static mesh from Blender and import into Unreal; verify scale and materials.
 - [ ] Export one MPFB character with baked materials and deform skeleton; verify import.
 - [ ] Document initial setup in `Docs/`: engine install, project checkout, fresh-checkout build procedure.