refactor(cli): add commands/, prompt.rs, parse.rs scaffold (no-op)

crates/relicario-cli/src/commands/mod.rs

@@ -0,0 +1,7 @@
+//! Per-command modules — one file per top-level subcommand.
+//!
+//! `main.rs` holds the clap surface (argument enums) and the dispatch
+//! `match`; the actual command bodies live here. Helpers shared between
+//! command modules (e.g. `commit_paths`, `resolve_query`) are defined in
+//! this file as `pub(crate)` so siblings can pull them in via
+//! `use crate::commands::*`.