Decide MVP shelter building style

AGRARIAN_DEVELOPMENT_ROADMAP.md

@@ -604,7 +604,11 @@ Target deliverable: A small group can join a server, spawn into one biome, gathe
 
 ## 0.1.I Shelter Building
 
-- [ ] Decide MVP building style.
+- [x] Decide MVP building style. MVP shelter building uses a crafted-kit style:
+  players gather natural materials, craft primitive frame/wall/roof panel
+  parts, combine them into one placeable primitive shelter, and place that
+  shelter through the server-authoritative placement component. Fully modular
+  wall-by-wall building stays deferred to `0.2.E Permanent Structures`.
 - [x] Create build placement mode.
 - [~] Add ghost preview.
 - [x] Add placement validation.

Docs/TechnicalDesignDocument.md

@@ -80,8 +80,12 @@ Early runtime systems should remain small and explicit:
 - Interaction component/classes: player-facing use/gather/build entry points.
 - Resource actors: gatherable wood, stone, fiber, water, wildlife, and future
   natural resources.
-- Buildable actors: campfire, primitive shelter, frames, walls, roof panels,
-  and later settlement infrastructure.
+- Buildable actors: campfire, one-piece primitive shelter kits, and later
+  settlement infrastructure. For the version 0.1 MVP, shelter construction is
+  intentionally kit-based: frame, wall panel, and roof panel items are crafted
+  as inventory parts and then combined into a single placeable primitive
+  shelter actor. Fully modular wall-by-wall construction is deferred to
+  permanent structures so the first survival loop remains reliable.
 - Persistence layer: save/load contracts for player and world state.
 
 Blueprints can compose and expose these systems, but core replicated behavior

Scripts/verify_shelter_building_style_decision.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+ROADMAP = ROOT / "AGRARIAN_DEVELOPMENT_ROADMAP.md"
+TECHNICAL_DESIGN = ROOT / "Docs" / "TechnicalDesignDocument.md"
+
+
+def require(path: Path, text: str) -> None:
+    data = " ".join(path.read_text(encoding="utf-8").split())
+    if text not in data:
+        raise SystemExit(f"FAIL: {path.relative_to(ROOT)} missing required text: {text}")
+
+
+def main() -> None:
+    require(ROADMAP, "[x] Decide MVP building style.")
+    require(ROADMAP, "crafted-kit style")
+    require(ROADMAP, "Fully modular wall-by-wall building stays deferred")
+    require(TECHNICAL_DESIGN, "shelter construction is intentionally kit-based")
+    require(TECHNICAL_DESIGN, "Fully modular wall-by-wall construction is deferred")
+    print("PASS: MVP shelter building style decision is documented.")
+
+
+if __name__ == "__main__":
+    main()