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* DiskIdTracker: RAM-resident is_uuid stored-bitmask sidecar + module split Move the is_uuid flags out of the i2e file into a separate id_tracker.is_uuid file in the compact StoredBitmask format (#9871), loaded whole into RAM as a RoaringBitmap on open and prefetched in preopen, so slot decoding never reads the flag from disk. Bump the on-disk format version to 2 (DiskIdTracker is unreleased; no migration). Add StoredBitmask::read_ones() in common to normalize any stored encoding into a bitmap of set positions, with logical_len validated against the u32 position space at open. Restructure disk_id_tracker: read_only.rs becomes read_only/{mod, lifecycle,live_reload,id_tracker_read} mirroring the immutable tracker, and reader.rs becomes reader/{mod,lifecycle,lookup,iter}. Also unbox the DiskMappingsRef iterators (impl Iterator instead of Box<dyn>), and make IdTrackerRead::iter_internal_versions fallible so the read-only disk tracker propagates storage errors instead of silently truncating; its implementation now reads the versions file in one pass (cleanup-on-open drains it anyway). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * Split disk_id_tracker mod.rs into lifecycle / read / write files Mirror the read_only/ layout: mod.rs keeps the struct and resident-RAM helpers, lifecycle.rs the build/open paths, id_tracker_read.rs the DiskMappingsSource + IdTrackerRead impls, id_tracker.rs the mutable IdTracker impl. Code moved verbatim; only imports and a field doc touched. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * Tighten disk_id_tracker docstrings around guarantees State contracts (residency, laziness, error semantics, atomicity) instead of narrating which structures hold or use what. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com>