docs: add TD 2025+ requirement, clean script for release

CookLevel.ALWAYS and absTime behavior require TD 2025+.
Removed enableExpr (caused issues), decoupled spring filter
with sqrt(speed) scaling for smooth high-speed motion.

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via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

Author: 3 people

README.md

@@ -20,6 +20,8 @@ Unlike random noise, Ornstein-Uhlenbeck motion always pulls back toward center 
 
 ## Install
 
+**Requires TouchDesigner 2025+** (uses `CookLevel.ALWAYS` and 2025.x absTime behavior).
+
 1. **[Download the .tox](https://github.com/REMvisual/touchdesigner-brownian-motion/releases/latest)** from Releases
 2. Drag into your TouchDesigner project
 3. Wire the CHOP output to whatever needs motion