* fix(#3801): register inline_plan_threshold in the defaults manifest (default 2) and correct settings-advanced
* chore(#3801): changeset fragment (pr number backfilled after PR creation)
* chore(#3801): backfill changeset PR number (4019)
* test(#3801): parse the defaults table with the shared markdown-table parser
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Co-authored-by: sim <sim@local>
