Keyset page SessionEntry history reads - #417
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Fixes ARN-54 and unblocks ARN-55 live Katagami verification.\n\nChanges:\n- Replace skip-based SessionEntries history scans with keyset paging by Sequence.\n- Reduce page size and adapt downward on QueryTooLarge/413.\n- Extend session-turn architecture contract so history reads cannot regress to broad skip scans.\n\nVerification:\n- cargo test --manifest-path os-apps/paw-agent/wasm/wasm-helpers/Cargo.toml\n- cargo test --manifest-path os-apps/paw-agent/wasm/context_preparer/Cargo.toml\n- cargo test -p temperpaw session_entry_readbacks_stay_within_bounded_query_budget --test session_turn_architecture