docs(aura-cli): note the --real real-data path in the module header

The header described `aura run` as synthetic-only; --real now also streams
real M1 bars through the #71 Source seam. Keep the entry-point doc honest.

crates/aura-cli/src/main.rs

@@ -5,6 +5,11 @@
 //! signal-quality harness (synthetic source → SMA-cross → Exposure → SimBroker →
 //! recording sinks), runs it deterministically (C1), and prints the run's
 //! metrics + manifest (#6) as canonical JSON to stdout (the headline C14 move).
+//!
+//! `aura run --real <SYMBOL> [--from <ms>] [--to <ms>]` feeds that same harness
+//! real M1 close bars, streamed lazily from the local data-server archive through
+//! the #71 Source seam (`M1FieldSource`) instead of the synthetic stream — the
+//! first real-data backtest from the CLI.
 
 mod render;