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A heal marker is an event, not a baseline: construction seeds pre-existing markers (startup false-alarm guard) but a newly-observed marker now raises the warning, so the first auto-heal surfaces (matches the live drill). Added tests for both halves. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6