feat(materials): masonry coursing, glass/banner materials, per-slot assignment, telephoto elevations

0.1.4 materials pass plus the camera fix levelling exposed.

Materials (Tools/ue_build_demo_map.py):
- ensure_material() gains optional masonry coursing (world-space course height,
  joint band, joint tint) and roughness variation, so facades read as coursed
  stone/stucco instead of one flat specular plane.
- WorldPosition is in centimetres: course heights in metres are scaled by 100
  (the first attempt divided by 0.55 and the coursing was invisible).
- connect_material_expressions returns False rather than raising, so every link
  now goes through a link() helper that logs failures; UE has no
  MaterialExpressionLess, so the joint mask is Frac -> Divide -> OneMinus -> Clamp.
- New materials: M_FacadeStoneShadow, M_FacadeGlass (specular 0.62 ~ IOR 1.5),
  M_FacadeBanner.
- Material assignment is now per SLOT keyed on the imported slot material name.
  It was slot-0 only, which on the hero is the banner, so stone, shadow stone and
  glazing still wore flat Blender materials. Hero now 4/4 slots.

Cameras (GigLineShotActor + ue_build_review_map):
- Optional per-shot ShotFieldOfView; the shot tuples take a 4th element.
- Elevations use a 42-55 deg lens from across the street: with the cameras
  levelled (0.1.2 follow-up) the building was small in frame, and tilting to fill
  it is what breaks the verticals. hero-facade-front sky 39% -> 20%,
  demo-spawn-view 23% -> 16%.

Screenshots re-rendered for the whole set.

MEMORY.md

@@ -525,3 +525,28 @@ Scope: facts and traps that cost time to establish. Planned work lives in [TODO.
   usage and a **traps** table; `setup.md` marks the fresh-checkout build verified and
   documents the two optional API keys; architecture 07 + combined doc corrected the
   build-output path.
+
+## 2026-11-09 — 0.1.4 materials + architecture-camera pass
+
+- **Material graphs**: `ensure_material()` now supports masonry coursing
+  (`courses_m`) and roughness variation. **UE's `WorldPosition` is in
+  CENTIMETRES**, so a course height in metres must be ×100 — the first attempt
+  divided by 0.55 and produced coursing 100× too fine to see.
+- **`connect_material_expressions` returns False instead of raising**, so an
+  unknown pin name leaves an input unconnected and the material silently compiles
+  with a default (a mask of 0 is invisible). All links now go through a `link()`
+  helper that logs failures. There is also **no `MaterialExpressionLess`**; use
+  `Frac → Divide → OneMinus → Clamp` for a soft threshold band, or
+  `MaterialExpressionStep`/`SmoothStep` if a hard one is wanted.
+- **Material assignment was slot-0-only**, which on the hero is the *banner* — the
+  stone, shadowed stone and glazing kept their flat Blender materials. Assignment
+  is now per slot, keyed on the imported slot material's name
+  (`glass`/`banner`/`stoneshadow`/`stone`/`roof`/`wall`). Hero: 4/4 slots.
+- New materials: `M_FacadeStoneShadow` (same coursing, a stop darker),
+  `M_FacadeGlass` (roughness 0.14, specular 0.62 ≈ IOR 1.5 expressed without a
+  refraction pass), `M_FacadeBanner` (the one saturated surface).
+- **Camera FOV**: levelling the elevation cameras left the building small in frame
+  (39 % sky). Added optional per-shot `ShotFieldOfView` to `AGigLineShotActor` and
+  a 4th element on the shot tuples; a long lens (42–55°) fills the frame from
+  across the street while the camera stays level, so verticals stay parallel.
+  `review-hero-facade-front` sky 39 → 20 %, `demo-spawn-view` 23 → 16 %.