hero: make the portals real recesses and land the facade on Z 0

The portal detail shot failed for a modelling reason, not a camera reason: the
doors were 0.1 m panels on a solid plinth, so they read as shading. The plinth is
now four piers plus a lintel band, with a 1.2 m reveal, stone jambs and lintels
standing 0.10 m proud and three mullions per opening. review-06 frames them from
8 m at eye height.

Two defects fixed while doing it: the jamb boxes hung 0.15 m below the pavement,
so the facade imported with min Z -15 cm; and a rebuild run against a read-only
.blend silently skipped the save, which is why screenshots kept showing the old
geometry.

ROADMAP.md

@@ -74,7 +74,7 @@ Owner: this session. Scope: the review scene used for all visual approval — th
 - [x] **Character placement shot**: `review-03-player-placement` shows the pawn (`AGigLineCharacter`) staged by `Tools/ue_build_review_map.py` with a cube behind it. Note: the pawn's capsule renders invisible in `-game` because the character has no visible mesh, so the shot shows where the player lands relative to the scene rather than the body.
 - [x] **Ground-contact detail shot**: `review-04-ground-contact`, knee height, close on the feet — the soles meet the floor and the shadow joins them.
 - [x] **Shadow-comparison detail shot**: `review-05-shadow-compare`, both cubes in one frame from a low angle; the floating cube's shadow is detached, the grounded one's touches.
-- [ ] **Detail shot of the hero façade portals**: the portals sit behind the colonnade and are only about 3.4 m tall against a 14.5 m façade, so from the review floor they read as dark recesses at best (`review-06`). Resolving them needs either a camera on the plinth itself or the portals rebuilt proud of the stylobate — recorded as work, not done.
+- [x] **Detail shot of the hero façade portals**: `review-06-hero-portals` from 8 m at eye height now fills the frame with all three doorways. The camera alone was not enough: the doors were flat panels on a solid face, so they were rebuilt as three genuine recesses — plinth split into four piers plus a lintel band, 1.2 m reveal, stone jambs and lintels standing 0.10 m proud, three mullions each. Facade bounds are now exactly Z 0..14.50 m; a jamb overhang had been sinking the model 0.15 m into the ground.
 - [x] Document the shot list, camera positions, and what each shot is evidence for in `Screenshots/README.md`; nine shots, each with an approval line.
 - [x] Extend the review floor beyond the hero façade: 160 m square centred on the façade, so façade shots stand on ground instead of the horizon band.
 - [x] Delete retired shots: the old `first-person` frame is gone and the camera list is now a single table so a change cannot leave an orphan.