Add per-axis seed modes

README.md

@@ -532,7 +532,15 @@ alone.
 ## Seed Control
 
 The main `seed` input is still the default master seed. Connect `SxCP Seed
-Control` to `seed_config` when you want to lock or vary specific axes.
+Control` to `seed_config` when you want to lock or vary specific axes. Each
+axis has its own mode plus seed value:
+
+- `auto`: legacy behavior; `-1` follows the main seed, `0` or higher fixes that
+  axis to the entered value.
+- `follow_main`: always follows the final generator's main `seed` input and
+  ignores the entered axis seed.
+- `fixed`: always uses the entered axis seed.
+- `random`: generates a fresh axis seed when the node runs.
 
 For normal prompt iteration, `SxCP Seed Locker` is usually simpler:
 
@@ -542,7 +550,7 @@ For normal prompt iteration, `SxCP Seed Locker` is usually simpler:
 - `reroll_seed`: `-1` makes the selected axis follow the main prompt seed;
   `0` or higher pins that selected axis to a specific seed.
 
-Seed values:
+Seed values in `auto` mode:
 
 - `-1`: follow the main seed.
 - `0` or higher: override only that axis.