Make command line references pipeline scoped

docs/internal/pipeline.md

@@ -97,6 +97,13 @@ codec, checks its complete schema and media identity, and records a content
 digest plus bounded producer provenance. A missing, ambiguous, invalid, or
 incompatible producer prevents the consumer step from starting.
 
+Resolution receives only exact stage-and-lane operational reference overrides.
+The CLI may offer broader pipeline- or lane-scoped selectors, but expands and
+arbitrates those before entering the framework. External overrides are applied
+after configured external defaults and local bindings. They cannot coexist
+with a generated binding for the same target and slot, and external unbinds do
+not remove generated handoffs.
+
 ## Execution And Ordering
 
 The runner validates its input, installs no-op state collaborators when none