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/0002-de-escalation-first-escalation-model.md

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+# ADR-0002: De-escalation-first escalation model
+
+- **Status:** Accepted
+- **Date:** TBD
+
+## Context
+
+The game involves security work, access denial, rare violent threats, and an emergency responder with greater authority. A design focused on attacking NPCs would undermine the intended workplace-simulation experience and make ordinary public behavior indistinguishable from danger.
+
+The plan explicitly calls for observation, gestures, dialogue, formal warnings, positioning, assistance, and emergency response in increasing levels.
+
+## Decision
+
+Represent escalation as explicit levels from 0 through 5:
+
+0. Observation
+1. Simple deterrence and polite direction
+2. Formal warning
+3. Blocking and physical positioning
+4. Radio for security assistance
+5. Emergency response
+
+The player is rewarded for selecting the lowest effective level. Emergency assistance is reserved for immediate threats and is evaluated after the incident. Physical force is not a default interaction.
+
+## Consequences
+
+### Positive
+
+- Reinforces judgment and communication as the main skills.
+- Makes simple actions, including raising a hand, mechanically meaningful.
+- Gives the player clear feedback about proportionality.
+- Keeps emergency response rare and consequential.
+
+### Negative
+
+- NPC reactions and threat assessment require more nuanced modeling.
+- Players may need clear feedback to understand why an escalation was or was not justified.
+- Designing fair edge cases will require playtesting.
+
+## Alternatives considered
+
+- **Combat-first design:** Rejected because it conflicts with the game’s core premise.
+- **Binary allow/deny interaction:** Rejected because it removes the interesting judgment between harmless behavior, refusal, and immediate danger.