Ruslan Nigmatullin 77cbcdb4a6
Preserve thread-local model ID state across replay and compaction ( #60942 ) ...
## What changed
- Initialize item and context-window ID generators per thread, reuse the stored window on resume, and give history reconstruction a separate item generator.
- Recover item ordinals from checkpoint replacement history, guardian history, and retained context without lowering the cursor established by earlier records.
- Stamp compaction resume metadata with the next item ordinal in append order, tracking the cursor in local and in-memory thread stores.
## Testing
Extend the history ordinal test to verify that a checkpoint records the cursor at its position in a batch, excluding later allocations.
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Ruslan Nigmatullin
77cbcdb4a6