Detail the NPC avatars and finish the realism follow-ups

Blender library
- Rebuild the face: sclera, iris and upper lid per eye, brow ridge, cheekbones,
  nose bridge and tip, ears with lobes, split upper/lower lips.
- Give each hand four fingers plus a thumb and end every sleeve in a cuff ring.
- Raise CHAR_MAX_VERTS 4000 -> 5000 (16 avatars still cost ~6.9 ms of a 50 ms
  frame), decimate the body to 26 %; characters are now 3,974-5,026 tris and
  3,744-4,807 verts. Rebuild all 8 variants and re-bake their AO maps.

Capture tooling
- Add a `portrait` stage to capture_realism.gd: freeze one NPC, park the crowd
  out of frame, stand the subject on open sidewalk, turn it into the camera and
  put the guard on the sunlit side. New --portrait-type=N picks the role.
- Add the npc_portrait_day concept and map the shot to it, so avatar detail is
  scored against a portrait instead of a wide street frame.

Flashlight
- Drop the fake additive beam (Materials.light_beam + the cone mesh): on GL
  Compatibility a first-person camera inside the cone renders it as a filled
  disc with a bright far ring. Keep the tight spot (14 deg, 20 m, energy 4.2)
  and its headless test; the visible shaft is now planned behind a Forward+
  preset.

Docs and task tracking
- Move the finished realism follow-ups (ground exposure, flashlight, NPC detail,
  judge re-check) to DONE.md and expand TODO.md with step-by-step plans for NPC
  gear fit, venue geometry plus the committed gallery, and the Forward+ preset.
- Record the decisions, gotchas and portrait recipe in MEMORY.md; update the
  Blender contract, the concept README and the capture section of README.md.
- Refresh the gallery captures affected by the avatar rebuild.

Checks: headless 228/228, Python 86/86, blender_assets audit exit 0,
scene_concepts audit all GOOD, screen_designs compare 11 good / 0 bad,
smoke_npc_budget OK, boot clean (only the known headless mesh warning).

docs/screens/concepts/README.md

@@ -20,6 +20,13 @@ file here; they are saved as `<name>-vN.png`.
 | `entrance_steps_podium` | granite steps, handrails, glass doors, the check-in podium |
 | `crowd_barrier_line` | steel barriers, a red carpet, a crowd with depth-of-field haze |
 | `responder_arrival_wide` | fire engine, turnout gear, red/blue light spill on wet pavement |
+| `npc_portrait_day` | close portrait of a pedestrian: skin with visible pores and stubble, fabric weave, shallow depth of field. The bar for an avatar close-up, not for the crowd shots |
+
+The `npc_portrait` capture in `capture_realism.gd` is staged, not posed by the
+crowd: it freezes one NPC on an open patch of sidewalk, parks the rest of the
+crowd out of frame, turns the subject into the camera and stands the guard on the
+sunlit side. It is the only shot where a face fills the frame, so it is the one to
+eyeball after an avatar change (`docs/screens/realism/2026-11-01-npc/`).
 
 Cross-cutting targets, for comparison with the 2026-11-01 captures in
 `docs/screens/realism/2026-11-01-v2/sheet.jpg`: