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fix: cap page store size to avoid long-overflow in DiskPageStore

Setting maxSizePerSession to Bytes.MAX (Long.MAX_VALUE) prevented
PageWindowManager from ever recycling slots in the per-session file,
so cumulative offsets eventually wrapped to a negative long and
FileChannel rejected reads/writes with "Negative position". Use a
generous-but-bounded 100 MB cap so windows recycle before overflow.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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