npc: AGigLineNPCPerson prefab + stable-named screenshots

- New C++ AGigLineNPCPerson: reusable NPC/pedestrian prefab built on the MPFB
  human. ACharacter capsule half-height 83 cm (total 1.66 m, head top ~1.66 m
  so a 1.60 m camera doesn't clip), the character skeletal mesh on the built-in
  mesh as the visible body (feet on Z 0), AutoPossessAI for 0.5.0 pedestrians.
  Staged at Z 0 in the review scene; captured as review-npc-prefab.png.
- AGigLineShotActor now names screenshots by stable camera name (no list-index
  prefix): inserting or reordering cameras no longer renumbers files or orphans
  the old ones. Re-rendered all review/demo shots with stable names.
- ue_build_review_map.py: chmod the target .umap before save_map (git marks maps
  444 on checkout, silently making save_map return False and dropping stages).
- Screenshots/README.md, ROADMAP, TODO updated for the prefab + stable names.
- DemoMap.umap rebuilt by the render pipeline (north buildings + demo cameras).

TODO.md

@@ -61,11 +61,11 @@ Owner: this session. Scope: the review scene used for all visual approval — th
 - [x] Put the character on the ground rather than floating. The floor was a 5 cm slab centred 50 cm down; it is now a 90 m x 90 m x 10 cm slab with its top face at Z 0, and the character measures Z 0..83 cm — feet on the plane (`Screenshots/README.md`).
 - [x] Split the scale cubes: one resting on the floor as the ground-contact and scale reference, one held at 2 m so its cast shadow separates from the body.
 - [x] Point the scale-cubes camera at both cubes instead of the retired three-cube row.
-- [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.
-- [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] **Character placement shot**: `review-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-ground-contact`, knee height, close on the feet — the soles meet the floor and the shadow joins them.
+- [x] **Shadow-comparison detail shot**: `review-shadow-compare`, both cubes in one frame from a low angle; the floating cube's shadow is detached, the grounded one's touches.
+- [x] **Detail shot of the hero façade portals**: `review-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`; shots use stable names with an approval line (10 review + 4 demo).
 - [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.
 
@@ -75,14 +75,15 @@ The MPFB character asset is planned as the NPC template (see `ROADMAP.md`). Keep
 
 - [x] Give the MPFB character asset a standing idle pose so review and NPC shots show a person, not an A-pose bind. Done: `Tools/mpfb_character_export.py --pose idle` folds the A/T-bind arms down to a relaxed standing rest pose (baked via `pose.armature_apply` before export; `upperarm01.L` rest z −0.71 → −1.91 rad), re-exported, re-imported (138 bones), rendered in `review-01-character`.
 - [x] Bake a second skin tone or clothing layer, so the character does not read as a grey mannequin in shots. Done: the v2-skin bake came out **black** and slow at 1024², so we synthesize a warm skin-tone diffuse directly (`Tools/mpfb_character_export.py` `make_diffuse`, with a darker shorts-suggestive bottom band) via a stdlib/numpy PNG writer. Character reads warm, not grey. Screenshot approved (`Screenshots/review-01-character`).
-- [ ] (open) Keep the character as a reusable NPC prefab: a visible body, a collision capsule, and a head-height check that the camera does not clip at 1.60 m — for when NPCs/pedestrians are wired in (`0.2.0+`), not the `0.1.0` player.
+- [x] Keep the character as a reusable NPC prefab: a visible body, a collision capsule, and a head-height check that the camera does not clip at 1.60 m — for when NPCs/pedestrians are wired in (`0.2.0+`), not the `0.1.0` player. Done 2026-11-07: `AGigLineNPCPerson` (C++), ACharacter with capsule half-height 83 cm / total 1.66 m (head at ~1.66 m, so a 1.60 m camera does not clip), the MPFB human on the built-in mesh as the visible body, `AutoPossessAI` for pedestrians; confirmed spawned feet-on-Z-0 and rendered in `Screenshots/review-npc-prefab` (☐ pending approval).
+- [x] Screenshots use stable camera names (no index prefix), so inserting a shot no longer renumbers/ orphans files; `AGigLineShotActor` + `Screenshots/README.md` updated.
 
 ### Asset production
 
 - [x] Establish a consistent scale test, named export presets, and repeatable import settings. Scale test = the three-cube calibration scene (`Art/blender/scaletest/`, regenerable via `Tools/scale_test_export.py`); named export preset `ue_metric_v1` (FBX settings in that script); named import preset `ue_metric_v1` (`FbxImportUI` settings in `Tools/ue_scale_test_import.py`). Both scripts are the templates for production asset export/import.
 - [-] Collect reference photography for manual façade work. Local only, never committed: `Art/reference/` is gitignored. **72 images in eleven folders**: hero façades to 4k, the El Capitan Theatre exterior series, premiere-night staging, Ovation Hollywood, the north side, and the Lee Drug neighbour. Gaps largely closed by the Flickr/web-search pass: the hero entrance is now documented (three portals with individual short flights — the inherited "eight steps, 12 m wide" is overturned), and the 6806–6822 retail run appears in an oblique 2013 frame. Still missing: a clean isolated frame of the door recess and a night frame of 6840 itself.
 - [x] Download reference photography for the two north-side buildings inside the 50 m buffer — TCL Chinese Theatre (OSM way 424105908, 6925 Hollywood Blvd) and Madame Tussaud's (way 424105889, 6933 Hollywood Blvd). Done 2026-11-06 with `Tools/commons_fetch.py` against the Wikimedia Commons API: eleven frames in the local `Art/reference/north-chinese/` and `Art/reference/north-tussauds/`, provenance in each `sidecar.json`, nothing committed.
-- [x] Model hero façade for the El Capitan Entertainment Centre site. **Second pass built 2026-11-07** (proportions recalibrated from the 2009 photograph: entablature 3.4 m, parapet 2.2 m, architrave and cornice bands, square pedestals — the first pass had 5.7 m of blank wall above the capitals and read as a warehouse). **First pass built 2026-11-07** (`Tools/hero_facade_build.py` → `Art/blender/hero/hero-facade-2026-11-07.blend` + JSON part report with evidence per part → `Tools/ue_hero_facade_import.py` → `/Game/Hollywood/ElCapitan/SM_HeroFacade`, 1892 tris, 4 materials, placed on the measured building line). Six columns at 4.96 m over the 25.75 m frontage, plinth, three portal flights (5 risers, not the old 8), entablature 2.2 m, parapet 1.6 m with motto band and medallions. **Screenshot approved** (`Screenshots/review-06` portals, `review-07/08` facade). Next pass: banner and window placement, then materials.
+- [x] Model hero façade for the El Capitan Entertainment Centre site. **Second pass built 2026-11-07** (proportions recalibrated from the 2009 photograph: entablature 3.4 m, parapet 2.2 m, architrave and cornice bands, square pedestals — the first pass had 5.7 m of blank wall above the capitals and read as a warehouse). **First pass built 2026-11-07** (`Tools/hero_facade_build.py` → `Art/blender/hero/hero-facade-2026-11-07.blend` + JSON part report with evidence per part → `Tools/ue_hero_facade_import.py` → `/Game/Hollywood/ElCapitan/SM_HeroFacade`, 1892 tris, 4 materials, placed on the measured building line). Six columns at 4.96 m over the 25.75 m frontage, plinth, three portal flights (5 risers, not the old 8), entablature 2.2 m, parapet 1.6 m with motto band and medallions. **Screenshot approved** (`Screenshots/review-hero-portals`, `review-hero-facade-front/oblique`). Next pass: banner and window placement, then materials.
 - [ ] Model surrounding block frontage.
 - [x] Model simplified background buildings directly across Hollywood Boulevard. Done 2026-11-07, the two in-scope north-side buildings — TCL Chinese Theatre (SM_TCL_Chinese_Theatre) and Madame Tussaud's (SM_Madame_Tussauds) — taken from the verified OSM blockout volumes and exported with `ue_metric_v1`, with a Y-mirror so they land north of Hollywood Blvd across the street from the hero (TCL spans Unreal Y 1802..9431, Tussaud's 1888..7586; road centreline ≈ 0, hero façade at Y −1450). Staged in the DemoMap as `North_TCL_Chinese` / `North_Madame_Tussauds`; demo shot `review-03-demo-north-buildings` captured. Simple flat facade materials (surfaces are the `0.1.4` patch).
 - [-] Build sidewalks, roads, and collision meshes. Terrain, road, sidewalks and kerbs exist (`Art/blender/terrain/`, `street/`) and are assembled in `site/site-2026-11-06.blend`; collision and details (crossing markings, kerb radii, aprons) are not built. Ground must follow the DEM: 3.94 m fall along the block, ~2 % crown between the gutters at ±10–11 m from the centreline, north sidewalk higher than south. Kerb height is an unresolved assumption — the DEM does not resolve it (`Geo/verification/2026-11-06-cross-sections.md`).
@@ -174,7 +175,7 @@ Suggested blender skills: **procedural-modeling** + **geometry-nodes** (the faç
 
 - [x] Generate MPFB human base mesh; export baked materials and deform skeleton. Done in bootstrap: idle-pose 19 158-vert human with a 137-bone standard rig, `Tools/mpfb_character_export.py` (now `--pose idle` + warm `make_diffuse`).
 - [x] Import character into Unreal; validate skeleton, scale, and materials. Done: `/Game/Test/Character` — `SkeletalMesh` (138 bones), `Skeleton`, warm `M_Character_Export` material with baked `T_Character_Diffuse`.
-- [ ] Promote the character asset into a reusable NPC prefab (visible body, collision capsule, idle pose) ready for pedestrians (`0.5.0`) once the third-person body lands.
+- [x] Promote the character asset into a reusable NPC prefab (visible body, collision capsule, idle pose) ready for pedestrians (`0.5.0`) once the third-person body lands. Done 2026-11-07: `AGigLineNPCPerson` (see the 0.1.0 Character-development item); `0.5.0` reuses it as the pedestrian base.
 - [ ] Create basic idle/walk animation set.
 - [ ] Verify animation plays correctly on the imported rig.
 
@@ -293,7 +294,7 @@ Suggested blender skills: **procedural-modeling** + **geometry-nodes** (the faç
 
 ### Simulation
 
-- [ ] Add pedestrian characters with navigation, reusing the idle-pose character asset as the NPC prefab (`/Game/Test/Character`).
+- [ ] Add pedestrian characters with navigation, using `AGigLineNPCPerson` (the reusable NPC prefab) as the base, driving it via AI/`AutoPossessAI`.
 - [ ] Implement crosswalk behavior (pedestrians use the designated crossing).
 - [ ] Add limited ambient traffic on the street network.
 - [ ] Optimize simulation cost to stay within frame budget.