Extract reverse JSONL scanning from session indexing - #32246
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## What changed - Add a generic `ReverseJsonlScanner` that reads seekable JSONL data from the end in bounded chunks, skips blank records, and reports malformed records without stopping the scan. - Use the scanner for reverse session-index lookups while preserving the existing behavior of ignoring invalid entries. ## Testing - Add coverage for unterminated final records, malformed JSON, blank lines, chunk boundaries, and records spanning multiple chunks. - Verify session-index lookup can skip an invalid record and still find valid entries on either side of it. GitOrigin-RevId: 66255f48492f74726d4ac4831cdc82f748de17d6
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Extract reverse JSONL scanning from session indexing
What changed
ReverseJsonlScannerthat reads seekable JSONL data from theend in bounded chunks, skips blank records, and reports malformed records
without stopping the scan.
existing behavior of ignoring invalid entries.
Testing
chunk boundaries, and records spanning multiple chunks.
entries on either side of it.