Implement TODO backlog: LATE phase fix, protester, CALL_SOMEONE, door lock, flashlight, persistence, navmesh, JSON localization, and release tooling

- Fix LATE shift phase (start 700s) so the violent-threat event is reachable
- Add PROTESTER archetype (rules, profile, colors, events in public venues)
- Add CALL_SOMEONE reaction (FSM -> ARGUING, influencer/trespasser/protester weights)
- Door lock: DoorState core class, L binding, red/green visual indicator,
  locked doors thwart FORCE_ENTRY
- Flashlight: G binding, SpotLight3D, perception radius bonus at evening/late
- Persistence: save shift results via Save autoload, history + best score on
  review screen, round-trip test
- Navigation: flat NavigationRegion3D navmesh, NavigationAgent3D path following
  with direct-movement fallback; steps made visual-only so NPCs reach entrance
- Localization: strings moved to content/strings.en.json (loader keeps
  lookup/fmt signatures; coverage test over all keys)
- Distribution: export_presets.cfg (Linux/Windows/macOS), tools/build_releases.sh,
  docs/RELEASING.md, prominent README Downloads section
- Remove stale signal_bus.gd (invalid static-signal experiment)
- Tests: 53 passing across 9 suites

src/core/npc_controller.gd

@@ -114,6 +114,9 @@ func _update_state_for_reaction(r: int) -> void:
 			fsm.transition_to("LOITERING_DISTANT")
 			will_return = true
 			return_delay_s = _roll_return_delay()
+		Rules.Reaction.CALL_SOMEONE:
+			# The NPC stops to call someone for help (PLAN.md: Level 2 reactions).
+			fsm.transition_to("ARGUING")
 		_:
 			pass
 
@@ -153,12 +156,13 @@ func decide_leave() -> bool:
 ## Perception pass: given the guard's distance (meters), return a perception
 ## result describing how the NPC reacts to the guard's presence. Pure and
 ## headless-testable; the presentation layer feeds it the real distance.
+## bonus_range widens awareness when the guard uses a flashlight at night.
 ## Returns { noticed: bool, band: String, reaction: int }.
-func perceive_guard(distance: float) -> Dictionary:
+func perceive_guard(distance: float, bonus_range: float = 0.0) -> Dictionary:
 	var band := "unaware"
 	if distance <= NEAR_RADIUS:
 		band = "near"
-	elif distance <= AWARE_RADIUS:
+	elif distance <= AWARE_RADIUS + bonus_range:
 		band = "aware"
 	var noticed := band != "unaware"
 	if noticed and not guard_noticed: