feat(aura-cli): de-prefix input-role markers ([in:price] -> [price])

Symmetric with the output de-prefix shipped in 2f49165: the composite
definition render now shows input roles as bare [<name>] markers, matching
the [<name>] outputs. One-token change in render_definition's input-role
loop (format!("in:{}", role.name) -> role.name.clone()); the two render
doc comments + the blueprint_view_golden / needle / MACD-render asserts
updated. Render-only; compiled_view_golden byte-identical; aura run --macd
unchanged.

refs #41

crates/aura-cli/src/main.rs

@@ -391,7 +391,7 @@ mod tests {
         let out = graph::render_blueprint(&sample_blueprint());
         // the sma_cross body is defined exactly once, with its interior + ports
         assert_eq!(out.matches("sma_cross(").count(), 1, "definition not rendered once:\n{out}");
-        for needle in ["[SMA]", "[Sub(#A,#B)]", "[in:price]", "[cross]"] {
+        for needle in ["[SMA]", "[Sub(#A,#B)]", "[price]", "[cross]"] {
             assert!(out.contains(needle), "missing {needle} in definition:\n{out}");
         }
     }
@@ -504,7 +504,7 @@ mod tests {
 where:
 
 sma_cross() -> (cross):
-   [in:price]
+     [price]
     ┌───└───┐
     ↓       ↓
   [SMA]   [SMA]
@@ -587,7 +587,7 @@ sma_cross() -> (cross):
         assert!(out.contains("[EMA(slow)]"), "slow EMA folds its param: {out}");
         assert!(out.contains("[EMA(signal)]"), "signal EMA folds its param: {out}");
         assert!(out.contains("[Sub(#A,#B)]"), "Sub shows its two ordered inputs: {out}");
-        assert!(out.contains("[in:price]"), "named MACD input role: {out}");
+        assert!(out.contains("[price]"), "named MACD input role: {out}");
         assert!(!out.contains("[param:"), "param marker nodes removed: {out}");
         assert!(!out.contains("[out:"), "output prefix dropped: {out}");
     }