feat: add policy-metadata-uri spec (requirements, design, tasks)

Author: afurious

.kiro/specs/policy-metadata-uri/.config.kiro

@@ -0,0 +1 @@
+{"specId": "1a2021b6-08d1-440a-a0f5-0f3fb784de1e", "workflowType": "requirements-first", "specType": "feature"}