# Dudley - Project Briefing
Last updated: 2026-02-11

## Current Project State
The Settled Reach: top-down immersive sim, single-character perspective, asymmetric information core mechanic, Rimworld-style storyteller. 41 confirmed decisions, 17 discussion rounds + 2 workshops complete. Engine selected (D-020: Rust/bevy_ecs server). Vertical slice defined (D-027). v0.1 Content Gap Analysis Workshop complete. Knowledge Graph & Information Boundaries Workshop complete (D-041).

## Status
STANDBY. This briefing will be populated when backend/engine implementation begins.

## Key Decisions for Your Domain
Read `decisions/architecture.md` (primary) and `decisions/content.md` (NPC model). Key decisions:
- **D-010:** Four architectural principles (client-server, info boundaries, deterministic sim, input events)
- **D-020:** Rust simulation server with bevy_ecs, MessagePack protocol to Godot client
- **D-024:** NPC ECS model (10 axes + CombatCapability component)
- **D-026:** Simulation tier engine (Active/Background/State-saved/Ungenerated, timestamp LRU)
- **D-030:** Testability architecture (hybrid Rust tests, deterministic replay critical)
- **D-031:** Time system (10 ticks = 1 game-minute, 4 day phases)

## Development Workflow
See `docs/DEVOPS.md` for full procedures. Your key targets:
- `make setup` — verify Rust toolchain (clippy + rustfmt)
- `make build-server` — `cargo build` in `server/`
- `make server` — `cargo run` in `server/`
- `make test-server` — `cargo test` in `server/`
- `make lint-server` — clippy (deny warnings) + rustfmt check
- `make ci-server` — full server CI pipeline (lint → build → test)
- Server code lives in `server/` — unit tests inline with `#[cfg(test)]`, integration tests in `server/tests/`
- Cross-boundary IPC fixtures in `tests/`

### Workshop Decisions (relevant to server implementation)
- **D-034: THE FRIEND ECS spec** — 14 ECS components defined for production-level NPCs (NpcIdentity, Want, Secret, Relationships[3], ToleranceThreshold, DailyRoutine, InformationInventory, Contentment, PersonalityTraits, TellState, SkillSet, AccessTierMap, TriangleMembership, MoodState)
- **D-035: Converged tag taxonomy (6+3)** — dialogue selection pipeline: access (hard filter) → situation (context filter) → trust (hard filter) → mood+topic (weighted selection). Server implements pipeline.
- **D-038: Audio architecture** — event-driven: SoundEventEmitter → ObserverSnapshot → SoundRenderer. Server emits sound events.
- **D-041: Knowledge Graph Data Model** — Per-entity `KnowledgeGraph` Component with BTreeMap storage (deterministic). 4-level confidence hierarchy (Suspects/KnowsOf/KnowsDetails/Direct). StableEntityId + EntityRegistry for stable entity references. Event-driven updates via KnowledgeEventQueue. Sprint 2 scope: data structures + direct observation + basic decay + observer snapshot integration (#112). Canonical Rust structs at `docs/workshops/knowledge-graph-information-boundaries/round2-synthesis.md` Part 3.

## Key Documents
- decisions/ - domain-split decision files (see decisions/README.md for index)
- docs/DEVOPS.md - build, test, lint, CI procedures
- docs/discussions/ - archived design rounds