Add multi-platform release builds for 0.9.0 (closes #138).

README.md

@@ -39,6 +39,8 @@ Packaged executables share native `bds-core` and `bds-server` dynamic libraries.
 
 Local macOS packages are ad-hoc signed without hardened runtime. A Developer ID and notarization remain optional release-channel steps for downloads that should pass Gatekeeper without a user override.
 
+Pushing a tag creates a draft Gitea release, builds native artifacts on the Linux arm64 runner, and publishes only after every target succeeds. Releases contain CLI/MCP and desktop downloads for Linux arm64/x64, macOS arm64/x64, and Windows x64. Linux desktop binaries are dynamically linked to the GTK 3, WebKitGTK 4.1, and libxdo packages supplied by the target Ubuntu architecture. macOS desktop downloads are ad-hoc-signed DMGs; Unix archives use `.tar.gz` and Windows uses `.zip`. All release packaging and Gitea API work is performed by the workspace's Rust release utility.
+
 ## Repository Map
 
 - `crates/bds-core` — data, engines, rendering, AI, publishing, and Lua
@@ -47,6 +49,7 @@ Local macOS packages are ad-hoc signed without hardened runtime. A Developer ID
 - `crates/bds-cli` — headless automation CLI over the shared engines
 - `crates/bds-mcp` — packaged stdio MCP transport over the shared MCP engine
 - `crates/bds-server` — reusable headless host, SSH transport, remote protocol, and desktop client library
+- `crates/bds-release` — portable tagged-release packaging and Gitea publishing utility
 - `specs` — authoritative Allium behavior specifications
 - `fixtures` — compatibility projects and generated-site fixtures
 - `locales` — UI and native-menu translations