[jdrumgoole]

• Rust MongoDB server: a rooted $or's branch in front of SBE stages is cached under the subplanner's o key (RM-429)
• Rust MongoDB server: a compound index scan over several intervals examines mongod's keys (RM-433)
• Rust MongoDB server: explain's winning plan reports its work accounting (RM-434; RM-692 filed)
• Rust MongoDB server: a $sort after a $group run in SBE counts the groups as SBE builds them (RM-435; RM-693 filed)
• Rust MongoDB server: $planCacheStats sizes $or and $elemMatch entries (RM-436; RM-694 filed)

A snapshot of rm-batch, frozen on rm-batch-ci so the lanes' later pushes don't cancel its CI. Each commit passed scripts/gate_rm.py locally. This run is their cross-platform check. It will be merged with a merge commit, pinned to the commit CI passed.

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