Allow shared evidence and bounded causal diagnosis with retry feedback

docs/diagnosis-builder-v1.md

@@ -29,9 +29,10 @@ uncertainty, final reason and recommended human-review actions.
 
 A confirmed result requires supported/strongly_supported confidence, a supported
 selected hypothesis that was not factually rejected, nonempty stored root-cause
-findings also cited by its evaluation, and at least one alternative with actual
-investigation actions and a reasoned countercheck citing evidence originating
-from that alternative. Unknown/duplicate/missing hypothesis IDs and fabricated
+findings also cited by its evaluation, and at least one alternative with a
+reasoned countercheck citing actual shared findings. Evidence provenance does
+not restrict which hypotheses may use it. See [Decision v2](diagnosis-decision-v2.md)
+for explicit scope limits, contradictions and retry feedback. Unknown/duplicate/missing hypothesis IDs and fabricated
 or empty support references are rejected. Loop confidence and its countercheck
 marker alone never authorize a diagnosis. Partial/empty snapshots are not proof
 of absence. The model must distinguish intended external behavior from local