Add initial README and architecture decision records for venue-driven simulation game

- Introduced README.md outlining game concept, mechanics, and planned venues.
- Added ADRs for venue-driven architecture, de-escalation-first model, explicit access verification, local single-player focus, event-based incident recording, and choice of Godot 4 with GDScript.

docs/adr/0006-godot-4-gdscript.md

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+# ADR-0006: Godot 4 with GDScript
+
+- **Status:** Accepted
+- **Date:** TBD
+
+## Context
+
+The project needs a game engine and programming language before implementation can begin. The game is a local single-player workplace simulation with navigation, crowds, NPC behavior, UI for access checks and dialogue, audio, and shift-scoring systems. The project benefits from fast iteration, low cost, and the ability to run rules and scenario tests headlessly.
+
+## Decision
+
+Use the Godot Engine 4.x with GDScript for gameplay logic. Model the venue-driven architecture as nodes, scenes, and custom `Resource` types. Use Godot's navigation, UI, audio, and headless mode. Test with the GUT framework.
+
+## Consequences
+
+### Positive
+
+- Free and open-source license with no per-seat or royalty cost.
+- Built-in 3D rendering, navigation, animation, UI, and audio reduce external dependencies.
+- GDScript is tightly integrated and fast to iterate on.
+- Headless mode supports deterministic, GUI-free automated tests.
+- Custom resources make scenario data editable and data-driven.
+
+### Negative
+
+- GDScript is less suited to very large, performance-critical systems than some alternatives.
+- The team commits to Godot's editor workflow and version cadence.
+- C# remains an option only if future needs justify adding a toolchain.
+
+## Alternatives considered
+
+- **Unity with C#:** Rejected due to licensing uncertainty and a heavier editor/workflow.
+- **Bevy with Rust:** Rejected because Rust adds friction and iteration time for a prototype team.
+- **Web-based TypeScript (Three.js/Babylon.js):** Rejected because Godot provides more out-of-the-box game systems and simpler desktop export.