docs: migrate project memory governance

.project-docs/50-evidence/topic-template.md

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+# Evidence Topic: {short title}
+
+## Metadata
+
+- Date:
+- Status: Active | Resolved | Superseded | Stale
+- Scope:
+- Confidence: Fact | Inference | Hypothesis
+- Source:
+- Last verified:
+- Stale trigger:
+
+## Question
+
+What needed evidence?
+
+## Evidence
+
+- Commit:
+- Files:
+- Commands:
+- Logs:
+- External source:
+
+## Finding
+
+What does the evidence support?
+
+## Impact
+
+What future planning or implementation should this affect?
+
+## Open Items
+
+-