Add optional full-band Galileo E1 CBOC support

docs/configuration.md

@@ -25,10 +25,17 @@ Default YAML files:
 - `e1_default.yaml`: requested 16.368 MHz nominal defaults.
 - `acquisition_example.yaml`: faster 4.092 MHz executable search.
 - `tracking_example.yaml`: 4.092 MHz tracking defaults.
+- `e1_cboc.yaml`: explicit full-band CBOC selection at 32.736 Msps and a
+  2.25 MHz analytic low IF.
 - `navigation_collection.yaml`: SignalSim IQ-to-I/NAV regression. Its default
   `tracking.architecture` is `e1c_pilot_aided_e1b`; the CLI can select
   `e1b_only` for an A/B replay.
 
+`AcquisitionConfig.modulation` and `TrackingConfig.modulation` independently
+select `BOC11` or `CBOC`. Both default to `BOC11`, so existing SignalSim and
+low-bandwidth configurations retain their measured behavior. A CBOC vector
+must set both fields to `CBOC` for a matched acquisition/tracking replica.
+
 The BOC lock detector parameters are part of `TrackingConfig`. The defaults use
 25 noncoherent power epochs, three confirmations, and the configured
 `loss_of_lock_epochs` for sustained failure. Carrier and BOC central/outer