docs: bring every document in line with the current build

README rewritten around the actual state (walkable DemoMap, blockout facades,
planned patches); Tools/README now lists all seventeen tools by role; build.md
gains the content pipeline table and the two enforced rules (one unit conversion,
collision decided at import). Setup gains a content-pipeline row, the toolchain
state notes the demo level exercises the engine path, release checks record the
Blender pre-check that backs traversal, PLAN points at ROADMAP/MEMORY/Screenshots,
and THIRD_PARTY_NOTICES gains rows for the hero facade and the candidate props.

Also fixed the last stale reference to Geo/scripts in MEMORY.md - a sweep found
old paths in six documents after the tool move, which the memory entry now warns
about.

MEMORY.md

@@ -43,7 +43,7 @@ Scope: facts and traps that cost time to establish. Planned work lives in [ROADM
 
 - **`flatpak run` does not work here.** Call the binary inside the app tree:
   `B=/var/lib/flatpak/app/org.blender.Blender/x86_64/stable/active/files`, then `LD_LIBRARY_PATH="$B/blender/lib" "$B/blender/blender" -b …` with `BLENDER_USER_SCRIPTS="$HOME/.var/app/org.blender.Blender/config/blender/5.2/scripts"`.
-- **Blosm needs two headless workarounds**, both already in `Tools/blosm_blockout.py`:
+- **Blosm needs two headless workarounds**, both already in `Art/blender/blockout/blosm_blockout.py`:
   1. it refuses to import until an asset directory is set, and the check fires before the mode is honoured;
   2. in background mode the default level table is empty, and the add-on then takes a path with a broken relative import (`from gui import addDefaultLevels`). Seeding one entry avoids it.
 - **Blosm projects on a sphere, not an ellipsoid.** Its frame is about 0.4 % oversized and rotated by meridian convergence — roughly 2 m at the theatre. Fixed with a six-parameter affine into EPSG:26911 (0.0 cm residual).
@@ -135,3 +135,8 @@ Scope: facts and traps that cost time to establish. Planned work lives in [ROADM
 - **`StaticMesh` has no trace-flag property in Python.** Collision complexity is set through `mesh.get_editor_property("body_setup").set_editor_property("collision_trace_flag", …)`; `StaticMeshEditorSubsystem.get_collision_complexity` reads it back but there is no setter.
 - **A `-game` run with a paused world still exits on timeout**, so a smoke test that "hangs" may simply be running.
 
+## 2026-11-07 — Documentation sweep
+
+- **Docs drift silently after a refactor.** Moving the geo scripts to `Geo/tools/` and the Blender builders into `Art/blender/*/` left stale paths in six documents and two tool READMEs. Grep for old paths (`.md` and `.py`) after any move, not just the ones that error at runtime.
+- **Every new tool needs a row in `Tools/README.md` and `Docs/build.md`**, or the next session will not know it exists. Both now list the full content pipeline in order.
+