release prep: rc.1 baseline and gating updates

packaging/aur/README.md

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+# AUR Packaging
+
+This directory contains AUR package sources for:
+- `openbitdo` (source build)
+- `openbitdo-bin` (prebuilt release assets)
+
+Publishing is automated by `.github/workflows/aur-publish.yml` and remains gated:
+- requires repository variable `AUR_PUBLISH_ENABLED=1`
+- requires secrets `AUR_SSH_PRIVATE_KEY` and `AUR_USERNAME`
+
+Publish flow:
+1. wait for release assets from a `v*` tag
+2. compute authoritative SHA256 values from released artifacts
+3. render `PKGBUILD`/`.SRCINFO` with pinned hashes
+4. push updates to AUR repos
+
+Template files used for release rendering:
+- `openbitdo/PKGBUILD.tmpl`
+- `openbitdo-bin/PKGBUILD.tmpl`