docs(release): stage artifacts folder

RELEASING.md

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+# DeskClaw — Windows Builds (Installer / Portable)
+
+This repository tracks source code. If you explicitly want Windows binaries committed into git, stage them under `artifacts/releases/win/`.
+
+## Build on Windows
+
+```powershell
+corepack enable
+corepack prepare pnpm@10.31.0 --activate
+pnpm run init
+pnpm run package:win
+node scripts/stage-release-artifacts.mjs --platform=win
+git add artifacts/releases/win
+git commit -m "chore(release): add windows artifacts"
+git push
+```
+
+## Notes
+
+- `package:win` outputs to `release/` (gitignored).
+- `stage-release-artifacts.mjs` copies files from `release/` into `artifacts/releases/win/` and writes a `manifest.json`.
+- Committing binaries will significantly increase repo size; prefer Releases if possible.
+