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.
Orients future sessions and Linear-driven skills: points at the spec,
the Linear project, the dependency chain (NAP-211 is the starting
point), the target workspace layout, and conventions (TDD, conventional
commits with maestro scope, real tmux+git in integration tests, no
mocking).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>