Add: windows mvp - transparent bugs not fixed

docs/MVP_ACCEPTANCE.md

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+# MVP Acceptance Checklist
+
+## API
+
+- [x] `GET /v1/health` returns version/build/uptime and active sprite pack.
+- [x] `GET /v1/state` requires bearer token.
+- [x] `POST /v1/command` requires bearer token and returns `202` for valid command.
+- [x] `POST /v1/commands` accepts batch in-order.
+- [x] malformed JSON returns `400`, server remains alive.
+
+## Command Pipeline
+
+- [x] duplicate command IDs are ignored within dedupe window.
+- [x] `SetState` updates state and default animation mapping.
+- [x] transient state with `ttl_ms` returns to durable state.
+- [x] `SetTransform` persists x/y/scale.
+- [x] `SetFlags` persists click-through/always-on-top/visible.
+
+## Config
+
+- [x] first run bootstraps `config.toml`.
+- [x] `auth_token` generated and reused across restarts.
+
+## Sprite
+
+- [x] selected sprite pack loads when present.
+- [x] missing selected pack falls back to `default`.
+- [x] runtime `SetSpritePack` successfully switches pack without restart.
+- [x] failed runtime `SetSpritePack` keeps current visuals and reports error in state snapshot.
+
+## Platform
+
+- [x] capability flags are exposed in `/v1/health`.
+- [x] non-supported platform operations do not crash the process.
+
+## Evidence
+
+- `cargo test --workspace` passes.
+- API auth coverage exists in `crates/sprimo-api/src/lib.rs` tests.
+- Config bootstrap and roundtrip coverage exists in `crates/sprimo-config/src/lib.rs` tests.
+- Sprite fallback coverage exists in `crates/sprimo-sprite/src/lib.rs` tests.