Remove line

Signed-off-by: Maria Teresa Ortega <teresa.ortega0903@gmail.com>

Author: teresa-ortega

src/lambkin/README.md

@@ -12,9 +12,7 @@ A benchmark is structured around three stages that LAMBKIN sequences and keeps o
 
 Each stage is a Python callable that receives a context object carrying configuration, paths, and state. You implement the logic; LAMBKIN handles the rest.
 
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-### SDK primitives
+### Core Concepts
 
 LAMBKIN exposes a small set of composable primitives. Together they cover the full lifecycle of a benchmark — from declaring inputs and sweeping parameters to launching processes and collecting results.