Implement prototype: venue-driven simulation core, scenarios, tests, and playable entrance scene

- Godot 4.3 project scaffold with first-person guard, procedural world,
  interaction HUD, access inspection, radio forms, debug overlay, shift review
- Simulation core: ShiftCoordinator, VenueScenario, EventScheduler, NPCController/FSM,
  AccessVerifier, EscalationManager, RadioSystem, IncidentRecorder,
  ReputationEvaluator, CrowdSystem, EventBus
- Three authored scenarios (Hollywood Blvd building, The Joke Shop, TV studio)
- Custom headless test runner (25 tests) replacing editor-dependent GUT,
  plus GitHub Actions CI
- Documentation workflow live: README, PLAN (tech stack), TODO/DONE, MEMORY

src/core/rules.gd

@@ -0,0 +1,139 @@
+class_name Rules
+## Shared constants and helpers for the simulation rules.
+
+func _init() -> void:
+	push_error("Rules is a static utility class and must not be instantiated.")
+
+## Escalation levels (0..5). Names must stay in sync with PLAN.md.
+enum Level {
+	OBSERVATION = 0,
+	SIMPLE_DETERRENCE = 1,
+	FORMAL_WARNING = 2,
+	BLOCKING = 3,
+	RADIO_ASSIST = 4,
+	EMERGENCY = 5,
+}
+
+const LEVEL_NAMES := {
+	Level.OBSERVATION: "Observation",
+	Level.SIMPLE_DETERRENCE: "Simple Deterrence",
+	Level.FORMAL_WARNING: "Formal Warning",
+	Level.BLOCKING: "Blocking",
+	Level.RADIO_ASSIST: "Radio Assist",
+	Level.EMERGENCY: "Emergency",
+}
+
+## NPC behavioral archetypes from PLAN.md.
+enum NpcType {
+	TOURIST,
+	PERFORMER,
+	INFLUENCER,
+	CONFUSED_VISITOR,
+	INTOXICATED,
+	TRESPASSER,
+	VIOLENT_THREAT,
+	MENTAL_CRISIS, # "51/50" style mental-health crisis character
+	AUTHORIZED_STAFF,
+	AUTHORIZED_GUEST,
+	DELIVERY,
+	RESPONDER,
+}
+
+const NPC_TYPE_NAMES := {
+	NpcType.TOURIST: "Tourist",
+	NpcType.PERFORMER: "Street Performer",
+	NpcType.INFLUENCER: "Influencer",
+	NpcType.CONFUSED_VISITOR: "Confused Visitor",
+	NpcType.INTOXICATED: "Intoxicated Pedestrian",
+	NpcType.TRESPASSER: "Trespasser",
+	NpcType.VIOLENT_THREAT: "Violent Threat",
+	NpcType.MENTAL_CRISIS: "Mental Health Crisis",
+	NpcType.AUTHORIZED_STAFF: "Authorized Staff",
+	NpcType.AUTHORIZED_GUEST: "Authorized Guest",
+	NpcType.DELIVERY: "Delivery",
+	NpcType.RESPONDER: "Responder",
+}
+
+## Access artifact kinds used by AccessVerifier.
+enum AccessKind {
+	NONE = -1,
+	RECOGNITION = 0,
+	WRISTBAND = 1,
+	ID = 2,
+	TICKET = 3,
+	CREDENTIAL = 4,
+	GUEST_LIST = 5,
+}
+
+const ACCESS_KIND_NAMES := {
+	AccessKind.RECOGNITION: "Recognition",
+	AccessKind.WRISTBAND: "Wristband",
+	AccessKind.ID: "ID",
+	AccessKind.TICKET: "Ticket",
+	AccessKind.CREDENTIAL: "Credential",
+	AccessKind.GUEST_LIST: "Guest List",
+}
+
+## Artifact validity states.
+enum ArtifactStatus {
+	VALID = 0,
+	EXPIRED = 1,
+	COUNTERFEIT = 2,
+	MISMATCHED = 3,
+	MISSING = 4,
+	AMBIGUOUS = 5,
+}
+
+const ARTIFACT_STATUS_NAMES := {
+	ArtifactStatus.VALID: "Valid",
+	ArtifactStatus.EXPIRED: "Expired",
+	ArtifactStatus.COUNTERFEIT: "Counterfeit",
+	ArtifactStatus.MISMATCHED: "Mismatched",
+	ArtifactStatus.MISSING: "Missing",
+	ArtifactStatus.AMBIGUOUS: "Ambiguous",
+}
+
+## NPC reaction outcomes after player actions.
+enum Reaction {
+	COMPLY = 0,
+	LEAVE = 1,
+	ARGUE = 2,
+	IGNORE = 3,
+	RECORD = 4,
+	THREATEN = 5,
+	RETURN_LATER = 6,
+	FORCE_ENTRY = 7,
+}
+
+## Player dialogue tones.
+enum Tone {
+	PROFESSIONAL = 0,
+	FRIENDLY = 1,
+	FIRM = 2,
+	SUSPICIOUS = 3,
+}
+
+const TONE_NAMES := {
+	Tone.PROFESSIONAL: "Professional",
+	Tone.FRIENDLY: "Friendly",
+	Tone.FIRM: "Firm",
+	Tone.SUSPICIOUS: "Suspicious",
+}
+
+## Shift phases by time of day.
+enum Phase {
+	EARLY = 0,
+	MIDDAY = 1,
+	EVENING = 2,
+	LATE = 3,
+}
+
+const PHASE_NAMES := {
+	Phase.EARLY: "Early",
+	Phase.MIDDAY: "Midday",
+	Phase.EVENING: "Evening",
+	Phase.LATE: "Late",
+}
+
+static func level_name(level: int) -> String:
+	return LEVEL_NAMES.get(level, "Unknown")