Merge pull request #5 from Open-Problem-Lab/agent-stop-rule

Add agent stop rule

Author: cschanhniem

docs/AGENT-STOP-RULE.md

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+# Agent Stop Rule
+
+Before opening a submission, confirm four items:
+
+- scope
+- source
+- limit
+- review need
+
+If one item is unclear, make the work smaller first.