Add operational runbooks and decisions stub

docs/00-governance/decisions.md

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+# Architecture Decisions
+
+Use this file to record durable project decisions that affect implementation patterns, interfaces, or workflow.
+
+## Decision Template
+- ID: DEC-YYYYMMDD-XX
+- Date:
+- Status: proposed | accepted | superseded
+- Context:
+- Decision:
+- Consequences:
+- Related Files:
+
+## Decision Log
+- No decisions recorded yet.