diff --git a/.claude/skills/start-sprint/SKILL.md b/.claude/skills/start-sprint/SKILL.md
index 1cd236ec9..e0be94911 100644
--- a/.claude/skills/start-sprint/SKILL.md
+++ b/.claude/skills/start-sprint/SKILL.md
@@ -51,6 +51,12 @@ Note the sprint number (N) from the output.
 The project version scheme is `v0.1.{sprint_number}`. After closing
 sprint N, the version is `v0.1.N`.
 
+Update `project.yaml`:
+- Set the `version` field to `0.1.N` (this is the source of truth).
+
+Update `server/Cargo.toml`:
+- Set `version = "0.1.N"` in `[package]`.
+
 Update `CHANGELOG.md`:
 - Move all entries under `## [Unreleased]` into a new section
   `## [v0.1.N] — YYYY-MM-DD` (using today's date).
@@ -60,7 +66,7 @@ Update `CHANGELOG.md`:
 
 ### M3. Commit the release
 
-Stage and commit `CHANGELOG.md`:
+Stage and commit `project.yaml`, `server/Cargo.toml`, and `CHANGELOG.md`:
 ```
 chore(meta): release v0.1.N
 ```
diff --git a/CLAUDE.md b/CLAUDE.md
index 364a9866e..e98de60c5 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -3,7 +3,8 @@
 A top-down immersive sim — occlusion-based detective game with combat elements, set in an original science fiction universe. Single-character perspective, asymmetric information as core mechanic, Rimworld-style storyteller. Godot 4 client + Rust/bevy_ecs simulation server via subprocess/IPC (D-020).
 
 **Official Title:** The Settled Reach (D-021)
-**Repository name:** commonwealth (historical code name, retained for path stability)
+**Repository name:** settled-reach (formerly commonwealth, renamed for clarity)
+**Version source of truth:** `project.yaml` (root `version` field, scheme: `0.1.{sprint_number}`)
 
 ## Project Structure
 
diff --git a/project.yaml b/project.yaml
new file mode 100644
index 000000000..6405b2b2b
--- /dev/null
+++ b/project.yaml
@@ -0,0 +1,37 @@
+name: The Settled Reach
+version: 0.1.9
+repository: settled-reach
+codename: commonwealth
+
+description: >
+  Top-down immersive sim with occlusion-based detection mechanics and
+  combat elements. Single-character perspective where asymmetric information
+  is the core gameplay mechanic. A Rimworld-style storyteller drives
+  emergent narrative across a detective-smuggler dual-lens campaign.
+
+setting: >
+  Original science fiction universe — the Settled Reach, a network of
+  star systems connected by Founder Gates. Neural lattice technology
+  enables soft immortality, forking, and re-embodiment. The v0.1
+  vertical slice takes place in Sova Transit District, Krenn System.
+
+architecture:
+  client: Godot 4 (GDScript)
+  server: Rust with bevy_ecs (simulation server)
+  transport: subprocess/IPC via TCP with MessagePack serialization
+  protocol: length-prefixed MessagePack frames (4-byte big-endian)
+  determinism: ChaCha20 seeded RNG, deterministic tick processing
+
+simulation:
+  tick_rate: 10 ticks per game-minute
+  time_model: 4 day phases (Morning, Afternoon, Evening, Night)
+  grid: dual-scale (0.5m simulation tiles, 1m visual tiles)
+  visibility: symmetric shadowcasting + forward/peripheral/blind vision cone
+  knowledge: per-entity knowledge graphs with confidence decay
+
+content:
+  format: YAML with JSON Schema validation
+  structure: campaigns/systems/stations/districts hierarchy
+  npcs: 10-axis model (7 essential + 3 supporting) with CombatCapability
+  dialogue: tagged line pools with 4-layer relational filtering
+  population: 30% flat / 50% mundane triangles / 20% intrigue-entangled
diff --git a/server/Cargo.toml b/server/Cargo.toml
index 5d7da1f66..137cc916b 100644
--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "settled-reach-server"
-version = "0.1.0"
+version = "0.1.9"
 edition = "2021"
 
 [dependencies]