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/rules.gd

@@ -37,6 +37,7 @@ enum NpcType {
 	AUTHORIZED_GUEST,
 	DELIVERY,
 	RESPONDER,
+	PROTESTER,
 }
 
 const NPC_TYPE_NAMES := {
@@ -52,6 +53,7 @@ const NPC_TYPE_NAMES := {
 	NpcType.AUTHORIZED_GUEST: "Authorized Guest",
 	NpcType.DELIVERY: "Delivery",
 	NpcType.RESPONDER: "Responder",
+	NpcType.PROTESTER: "Protester",
 }
 
 ## Access artifact kinds used by AccessVerifier.
@@ -103,6 +105,7 @@ enum Reaction {
 	THREATEN = 5,
 	RETURN_LATER = 6,
 	FORCE_ENTRY = 7,
+	CALL_SOMEONE = 8,
 }
 
 ## Player dialogue tones.