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The misclassified-wisps check could detect issues that should be wisps but couldn't fix them because bd update lacked an --ephemeral flag. Now that beads supports `bd update <id> --ephemeral` (steveyegge/beads#1263), implement the actual fix to mark detected issues as ephemeral. Closes #852 Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>