Add bakery.toml and release workflow

Wires bread into the bakery ecosystem: prebuilt binaries are published to
dl.breadway.dev and GitHub Releases on every v* tag via the self-hosted
hestia runner. bakery install bread downloads, verifies, and wires the
systemd unit automatically.

bakery.toml

@@ -0,0 +1,18 @@
+name = "bread"
+description = "Reactive automation daemon and CLI for Linux desktops"
+binaries = ["breadd", "bread"]
+system_deps = []
+bread_deps = []
+
+[[service]]
+unit = "breadd.service"
+enable = true
+
+[config]
+dir = "~/.config/bread"
+example = "breadd.toml"
+
+[install]
+post_install = [
+    "systemctl --user is-active --quiet breadd || systemctl --user start breadd",
+]