Add: windows mvp - transparent bugs not fixed

docs/RELEASE_TESTING.md

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+# Release Packaging and Behavior Testing (Windows)
+
+## Artifact Layout
+
+Current release package type: portable ZIP.
+
+Expected contents:
+
+- `sprimo-app.exe`
+- `assets/sprite-packs/default/manifest.json`
+- `assets/sprite-packs/default/sprite.png`
+- `README.txt`
+
+Generated outputs:
+
+- `dist/sprimo-windows-x64-v<version>.zip`
+- `dist/sprimo-windows-x64-v<version>.zip.sha256`
+
+## Commands
+
+Use `just` for command entry:
+
+```powershell
+just check
+just test
+just build-release
+just package-win
+just smoke-win
+```
+
+`just package-win` calls `scripts/package_windows.py package`.
+`just smoke-win` calls `scripts/package_windows.py smoke`.
+
+## Behavior Test Checklist (Packaged App)
+
+Run tests from an unpacked ZIP folder, not from the workspace run.
+
+1. Launch `sprimo-app.exe`; verify default sprite renders.
+2. Verify no terminal window appears when launching release build by double-click.
+3. Verify global hotkey recovery (`Ctrl+Alt+P`) forces interactive mode.
+4. Verify click-through and always-on-top toggles via API commands.
+5. Verify `/v1/health` and `/v1/state` behavior with auth.
+6. Verify `SetSpritePack`:
+   - valid pack switches runtime visuals
+   - invalid pack keeps current visuals and sets `last_error`
+7. Restart app and verify persisted config behavior.
+8. Confirm overlay background is transparent (desktop visible behind non-sprite pixels).
+9. Confirm no magenta matte remains around sprite in default pack.
+
+## Test Log Template
+
+- Date:
+- Artifact:
+- Commit:
+- Tester:
+- Result:
+- Notes:
+
+## Issue Evidence Gate
+
+Before release sign-off for a bug fix:
+
+1. Link the issue file (`issues/issueN.md`) in the test log.
+2. Ensure before/after screenshot evidence is referenced from the issue:
+- before: `issues/screenshots/issueN-before-YYYYMMDD-HHMMSS.png`
+- after: `issues/screenshots/issueN-after-YYYYMMDD-HHMMSS.png`
+3. Record verification commands and outcomes in the issue:
+- `cargo check --workspace`
+- `cargo test --workspace`
+- `just qa-validate`
+
+Legacy issues may reference `issues/screenshots/issueN.png` as before evidence.