fix: bd ready excludes ephemeral (wisp) issues (hq-t15s)

Wisps are ephemeral issues used for patrol/operational cycles and should
not appear in `bd ready` output as trackable work items. Added ephemeral
exclusion filter to both the GetReadyWork() function and ready_issues VIEW.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/storage/sqlite/schema.go

@@ -230,6 +230,7 @@ WITH RECURSIVE
 SELECT i.*
 FROM issues i
 WHERE i.status = 'open'
+  AND (i.ephemeral = 0 OR i.ephemeral IS NULL)
   AND NOT EXISTS (
     SELECT 1 FROM blocked_transitively WHERE issue_id = i.id
   );