# Architecture Review Report

**Date:** 2026-06-23  
**Engine:** Unity 6 (URP 17.3) + FishNet v4 + Synapse UDP  
**GDDs Reviewed:** 16  
**ADRs Reviewed:** 7  

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## Verdict: PASS

All requirements covered. No cross-ADR conflicts. No engine issues. Architecture is internally consistent and ready for implementation.

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## Traceability Summary

- Total requirements: 40
- Covered by ADR: 26 (65%)
- No ADR needed (implementation detail): 14 (35%)
- Gaps: 0 (0%)

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## Cross-ADR Conflicts

None.

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## ADR Dependency Order

**Foundation (no dependencies):**
1. ADR-0001: Relay Transport Integration Strategy
2. ADR-0003: ScriptableObject Asset Loading Strategy

**Depends on Foundation:**
3. ADR-0002: Scene Architecture and DontDestroyOnLoad Boundaries
4. ADR-0004: FishNet Client-Hosted Authority Model

**Depends on Core:**
5. ADR-0005: FishNet v4 Prediction Implementation Pattern
6. ADR-0006: Named Physics Layer Architecture

**Feature:**
7. ADR-0007: HUD Implementation — uGUI over UI Toolkit

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## GDD Revision Flags

None — all GDD assumptions are consistent with accepted ADRs and engine reality.

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## Engine Compatibility

- All ADRs target Unity 6 + FishNet v4
- FishNet source confirmed at `Assets/FishNet/`
- Cinemachine 3.1.7 confirmed via Package Manager
- `IReplicateData` / `IReconcileData` interfaces verified in source: `GetTick()`, `SetTick(uint)`, `Dispose()`
- `Transport` abstract class verified: `Initialize()`, `HandleClientConnectionState()`, `HandleServerConnectionState()`, `HandleRemoteConnectionState()`, `GetConnectionState()`
- No deprecated API references found

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## Architecture Document Coverage

`docs/architecture/architecture.md` covers all 16 MVP systems. Layer map complete. Module ownership defined. Data flows documented. API boundaries specified. No orphaned architecture.

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## Required ADRs

None — all identified decisions are covered by ADR-0001 through ADR-0007.

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## Next Steps

Architecture review PASSED. The design and architecture phase is complete for MVP. Implementation can begin.

**Recommended implementation order (from ADR dependency sort):**
1. `RelayTransport : Transport` (ADR-0001) — proves networking stack end-to-end
2. Scene setup + DDOL singletons (ADR-0002) — structural skeleton
3. ItemDatabase + GlobalRules_SO (ADR-0003) — pure data, zero risk
4. RunnerController with prediction (ADR-0005) — the game IS the movement
5. EyeCameraController — pan/zoom/cursor makes the Eye playable
6. LoSManager + physics layers (ADR-0006) — stealth system online
7. HUD shells (ADR-0007) — minimum player feedback
