Add crowd presentation, fix NPC navigation, refresh screenshots

NPC navigation (previously dead in the live game)
- Only assign NavigationAgent3D.target_position when it changes: re-assigning every
  frame invalidated the path, so get_next_path_position() kept returning the current
  point and avatars never moved.
- Follow the first path point that is closer to the destination than the avatars are.
  Nav points sit on the navmesh plane (y=0) while bodies stand at y~0.5, so the old
  3D distance test always looked "already there"; path[0] is also the old start point,
  so a naive "far enough away" pick steered backwards and oscillated.
- Fix fsm.state -> fsm.current_state in the idle-lifetime check.

Crowd presentation
- Aggressive behavior, visible weapons, and responder arrivals make idle bystanders
  stop and face the incident for 12 s; someone waiting at the entrance keeps focus.
- Panic (mood >= 0.75) walks people away from the door at 2.4 m/s, then they despawn.
- Wire reactions to EventBus.crowd_changed: CrowdSystem.apply_event() emits on the bus,
  not on its own `changed` signal (the first wiring received nothing).
- Measured a 16-NPC entrance at ~1.2 ms/frame (824 fps, vsync off), so no LOD/culling.

World and HUD
- Skyline is now a ring of four alpha-scissored planes at 200 m instead of a single
  plane; PlaneMesh defaults to horizontal, which is why the backdrop rendered as a band
  overhead. Larger ground plane, mipmapped texture, scissor threshold 0.5 (0.3 left
  mip dashes in the sky), lifted albedo so the city is not pure black.
- Flashlight aims straight ahead and lights the person/door instead of the ground.
- Shorter HUD controls line so it stops overlapping itself.

Tests, tooling, docs
- Headless suite 98 -> 105 (new test_crowd_presentation.gd, 7 tests).
- New smoke_crowd.gd: rubbernecking, panic, and flee-target sanity.
- capture_screenshots.gd starts a shift from the venue menu and stages the night set
  properly; all six README screenshots regenerated.
- README, TODO/DONE (crowd section moved), MEMORY updated. Version 0.2.4.

MEMORY.md

@@ -21,8 +21,8 @@ Session memory for durable decisions, state, and gotchas. Keep concise, remove o
   Windowed control smoke: `godot --path . --script res://src/test/smoke_focus_radial.gd` → exit 0.
 - `main` is in sync with origin. **v0.2.2** tags the session-shell + world-follow-up commit;
   CI builds the portable binaries, NSIS installer, and AppImage on the tag push.
-- Next work: `TODO.md` crowd presentation (rubberneck + panicked NPCs), then emergency aftermath
-  (evacuation, unjustified-call investigation).
+- Next work: `TODO.md` emergency aftermath (evacuation, unjustified-call investigation), then
+  body-camera replay timeline and NPC theater poses.
 - Do not re-open `override_access`. Do not bind wand to `W`. Do not remove the radio easter egg.
 
 ## Current State
@@ -69,11 +69,38 @@ Session memory for durable decisions, state, and gotchas. Keep concise, remove o
   default, `B` toggles it, and a formal warning arms it and writes a `body_camera` incident event.
   Blocking also calls `_station_between()` to physically place the guard 0.9 m from the NPC toward
   the entrance. `_request_reason()` logs the NPC's seeded `dialogue_lines` pick.
+- **NPC navigation was dead (fixed 2026-10-31):** avatars never moved in the live game, for three
+  stacked reasons. (1) `agent.target_position` was re-assigned every physics frame, which
+  invalidates the path so `get_next_path_position()` keeps returning the current point — only set
+  it when the target changes. (2) Nav path points sit on the navmesh plane (y=0) while bodies stand
+  at y≈0.5, so a 3D "are we there" test always looked 0.5 m away and the horizontal direction was
+  zero — compare horizontally. (3) `path[0]` is the old start point, so picking any point "far
+  enough away" can pick the point behind you and oscillate — pick the first point that is
+  **closer to the goal** than the current position. `_nav_try_frames`/`_move_direct` fallback is
+  still there.
+- **Crowd reactions listen on the EventBus:** `CrowdSystem.apply_event()` emits
+  `event_bus.crowd_changed`; its own `changed` signal is never emitted. `GameManager._connect_crowd()`
+  therefore connects to `coordinator.event_bus.crowd_changed` (reconnect after every
+  `coordinator.setup()`, which recreates both crowd and event bus).
+- **Crowd presentation:** `NpcAvatar.start_rubberneck(at)` (idle bystanders away from the door stop
+  and face the incident for 12 s) and `start_flee(from)` (panic: walk away at 2.4 m/s, then free
+  themselves). Someone `awaiting_interaction` within 3 m of the door is "engaged" and does not
+  rubberneck. Use `position` (not `global_position`) for that distance check so it also works in
+  headless tests outside the tree.
+- **Perf:** a busy 16-NPC entrance measured ~1.2 ms/frame (824 fps with vsync off, 800 samples),
+  so LOD/culling is not warranted at `MAX_LIVE_NPCS = 16`. Re-measure before raising the cap.
 - **Incident recording was dead:** `IncidentRecorder.start_incident()` was never called, so every
   `add_event`/`add_access_evidence` silently no-opped and the review always showed 0 incidents.
   `_begin_incident()` now starts one per focused NPC (`has_open_incident()` guard), verbs call
   `_ensure_incident()`, and `ShiftCoordinator._finish_shift()` closes leftovers as `unresolved`
   before building the review.
+- **Skyline backdrop (2026-10-31):** `PlaneMesh` defaults to a **horizontal** XZ plane — set
+  `mesh.orientation = PlaneMesh.FACE_Z` or the "backdrop" renders as a band overhead. The skyline
+  is now a ring of four 400x60 planes at 200 m (center y=30, so building bases meet the ground),
+  `TEXTURE_FILTER` default, `TRANSPARENCY_ALPHA_SCISSOR` with threshold **0.5** (0.3 left faint
+  mip dashes across the sky), unshaded with a lifted albedo (`Color(2.6,2.7,3.0)`) so it is not
+  pure black. Ground is 500x500 so no sky gap shows under the buildings. The `skyline.png` import
+  needs `mipmaps/generate=true`.
 - **Asset gotcha:** `assets/textures/game_ready/` is *not* imported (no `.import`). Use the
   imported `assets/textures/skyline.png` path. Untracked duplicate folder should not be referenced.
 - Host sign-in follow-up remains deferred. PLAN.md + ADRs 0007–0010 still describe the intended UX.