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M docs/tasks/skeleton.md

@@ 136,3 136,18 @@ Invariants:
 - `TilePx` references confined to `render.go` — pixel conversion happens only at render time
 - No external asset files (png/jpg/wav/ttf/otf) anywhere in the repo
 - `git status` clean after `make build` + `make build-wasm` — `.gitignore` correctly excludes all artifacts
+
+## Conclusion
+
+Outcome: skeleton milestone delivered — native window and browser WASM both render the 5-room placeholder ship at `c71f238`.
+
+Invariants:
+- All drawing uses virtual 640×360 — `TilePx` references confined to `render.go`.
+- Single codebase for native + WASM — no `//go:build`, no platform-suffixed files; `GOOS=js GOARCH=wasm go build` passes.
+- Tile-unit storage, render-time pixel conversion — `Room` fields are pure ints; conversion in `drawRoom` only.
+- No external asset files — repo contains no image/audio/font binaries.
+- `ship.go` free of Ebitengine imports — verified by grep.
+
+Future work:
+- Design prose mentions `text/v2` for labels while Plan + code use `ebitenutil.DebugPrintAt`; harmless doc drift, reviewer flagged sub-threshold. Justification: Plan was the contract and was approved with the `DebugPrintAt` choice; swap to `text/v2` + real face is a polish-milestone concern, not skeleton.
+- Git init was done inline before Phase 1 (task file predates any branch/worktree workflow); future milestones should set `**Branch:**` / `**Worktree:**` headers up front.