ctl: interactive shell with history, editing and completion

`rsp ctl` opens a prompt in the spirit of bluetoothctl. Lines are parsed with
the same clap definitions as the one-shot CLI, so every command and flag works
exactly as it does from a terminal, `help <command>` included.

Tab completes subcommands, and track/album/artist paths for `play` through
`db-complete` (run out of process, keeping its 100 ms timeout away from the
input loop). History lives in the state directory. Piped input falls back to a
plain line loop, so `rsp ctl < commands` works without a terminal.

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 51eebbb..ee4a077 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,6 +36,7 @@ notify-rust = "4.17.0"
 md-5 = "0.11.0"
 hex = "0.4.3"
 zbus = { version = "5", default-features = false, features = ["blocking-api"] }
+rustyline = "19.0.0"
 
 [profile.release]
 opt-level = "z"