Editor hygiene + remove redundant idle-position clamp in predictions

- rotatingMachine.html: add default name:{value:""} to the editor
  defaults block (standard Node-RED pattern; was missing).
- nodeClass.js: clear node status badge on close — matches the
  pattern already in other EVOLV node close handlers.
- specificClass.js: remove the `(x <= 0) ? 0 : ...` guard in the
  flow and power prediction methods. The guard was redundant:
  predictions only run while the FSM is in an active state
  (operational / starting / warmingup / accelerating / decelerating),
  none of which produce x=0. Math.max(0, rawFlow) still clamps
  negative extrapolation. Net: same behaviour in production, less
  dead code.

All 10 basic tests pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/nodeClass.js

@@ -405,6 +405,7 @@ class nodeClass {
       clearTimeout(this._startupTimeout);
       clearInterval(this._tickInterval);
       clearInterval(this._statusInterval);
+      this.node.status({});  // clear node status badge
 
       // Clean up child measurement listeners
       const m = this.source;