Clarify evidence tier authority and proof-of-concept approval gate

docs/business-model/client-lifecycle.md

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+# Client Lifecycle
+
+## Proof-of-Concept Fix Approval Gate
+
+During the proof-of-concept stage, agents may detect issues, gather evidence, and draft proposed fixes.
+
+Any fix that publishes to a client-facing surface requires human approval before it goes live.
+
+This includes, but is not limited to:
+
+- Google Business Profile edits
+- Review responses
+- Q&A answers
+- Business descriptions
+- Service descriptions
+- Hours
+- Phone numbers
+- Booking links
+- Website changes
+- Directory or citation updates
+
+The lifecycle must preserve the reconnaissance-versus-execution rule:
+
+Agents may detect and draft.
+Humans approve before publish.