Allow well-formed bread.command events on the emit bus

Docs already said any module or app could publish bread.command.<app>.<verb>,
but command is reserved so both unsourced bread-emit and sourced App emit
rejected the whole namespace. Keep command unclaimable as an app id; accept
bread.command.<known-app>.<verb> (and let an app command another known app).
Also ship bread-emit and bread-module-host, and give udev enumerate the same
classification fields as a live add so boot-time devices are not all unknown.

bakery.toml

@@ -1,6 +1,6 @@
 name = "bread"
 description = "Reactive automation daemon and CLI for Linux desktops"
-binaries = ["breadd", "bread"]
+binaries = ["breadd", "bread", "bread-emit", "bread-module-host"]
 system_deps = ["systemd-libs", "openssl", "zlib"]
 optional_system_deps = ["bluez", "hyprland"]
 bread_deps = []