Adds requirements, streamlines CLI helper procedures

guidance/workflow/optional/lean-interface-iteration.md

@@ -0,0 +1,28 @@
+# Lean Interface Iteration
+
+Rule set name: `lean-interface-iteration`
+
+Rule set ID: `LII`
+
+Status: optional, prompt-activated only
+
+Trigger examples:
+
+- `Apply the lean-interface-iteration rules.`
+- `Apply LII rules.`
+
+LII-0001: Apply this rule set only when it is explicitly requested in the prompt.
+
+LII-0002: The target of work under this rule set is the iterated product state for the addressed iteration only.
+
+LII-0003: Optimize the addressed interface toward the leanest and least complex model that still satisfies the iteration order.
+
+LII-0004: Backward compatibility, legacy aliases, and compatibility shims are not required unless the prompt explicitly asks to preserve them.
+
+LII-0005: Prefer one authoritative interface over multiple overlapping parameters, flags, or naming variants.
+
+LII-0006: Remove or avoid transitional interface layers when they are not required by the addressed iteration order.
+
+LII-0007: Update affected tests, guidance, requirements, and documentation so they describe the simplified interface model rather than a mixed legacy-and-new model.
+
+LII-0008: Never change behavior, interfaces, or surrounding areas that are not addressed by the current iteration order.