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New `maestro-installer` crate exposing the `maestro-install` binary. Bootstrap flow: `cargo install --git ... maestro-installer && maestro-install` runs `cargo install` for `maestro-daemon` and `maestro-cli`, optionally drives `maestrod configure`, and on systemd hosts writes a user unit at `~/.config/systemd/user/maestrod.service` plus reload/enable/start. Pure builders (cargo install args, systemctl args, unit body) live in the lib and are unit-tested; main.rs is the prompt glue. Refs NAP-225.