Refine README description for coding-agent harness

Updated the description for clarity and conciseness.

Author: beacoder

README.md

@@ -2,7 +2,7 @@
 
 # python-agent-harness
 
-**A lightweight Python coding-agent harness for building reliable autonomous coding agents.**  
+**A lightweight Python coding-agent harness for reliable autonomous coding.**  
 FSM-driven execution · OpenAI-compatible · built for daily use and easy customization
 
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