first working guide-board architecture core

extensions/sample-noop/INTENT.md

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+# INTENT
+
+## Extension Name
+
+`sample-noop`
+
+## Purpose
+
+`sample-noop` is a tiny guide-board extension used to prove that the core can
+discover extensions, validate profiles, and build run plans without depending on
+CMIS or any external test harness.
+
+It should stay boring. Its job is to exercise the guide-board contracts before
+real extension adapters add domain-specific runners and normalizers.