Set up DOTS + Netcode for Entities foundation

One-time stack setup per Docs/dots-setup-task.md (Unity 6.4.7 / 6000.4.7f1).
Packages: entities 6.4.0, entities.graphics 6.4.0, netcode 1.13.2, physics 1.4.6.

- Assets/_Project asmdef split: ProjectM.Simulation/Client/Server/Authoring (root ns ProjectM)
- GameBootstrap : ClientServerBootstrap; verified separate client + server worlds in Play Mode
- Gameplay subscene wired into SampleScene as a baking target
- Heartbeat component + Burst ISystem; EditMode smoke test green (1/1)
- In-repo Obsidian vault (Docs/Vault) incl. DR-001 (plain-Entities test over internal NetCodeTestWorld)
- Portable .mcp.json (basic-memory + serena via ${CLAUDE_PROJECT_DIR}); CLAUDE.md conventions
- .gitignore for DOTS baking cache + machine-local config

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Docs/Vault/00_Home/Home.md

@@ -0,0 +1,25 @@
+---
+tags:
+- moc
+- home
+updated: 2026-05-29
+permalink: gamevault/00-home/home
+---
+
+# Project M — Home (Map of Content)
+
+Multiplayer game on **Unity DOTS** (Entities) + **Netcode for Entities** (server-authoritative, client prediction). This vault is the canonical, cross-machine, human-facing record. Code lives in `Assets/_Project/`; engine/API truth comes from **context7**, not this vault.
+
+## Map of Content
+
+- **Vision** → [[Pillars]] — design pillars & locked decisions
+- **Game Design** → [[Systems_Index]] — per-system design docs
+- **Roadmap** → [[Milestones]] · [[Backlog]]
+- **Sessions** → `07_Sessions/2026/` — dated work logs (latest: [[2026-05-29_Project_Setup]])
+- **Decisions** → `07_Sessions/_Decisions/` — decision records (DR-###) · [[DR-001_Netcode_Test_Harness]]
+- **Meta** → [[Documentation_Protocol]] · [[Tags]]
+- **Templates** → [[Session_Log_Template]] · [[Decision_Record_Template]]
+
+## How knowledge is organized
+
+See [[Documentation_Protocol]]. In short: design / decisions / sessions live here (committed to git); **basic-memory** recalls over these notes; **serena** navigates C# symbols; native Claude memory holds machine-local facts; **context7** is the source of truth for DOTS / Netcode APIs.