v0.10.2-beta — Lanczos OOB fix at t≥4

Fixed

Lanczos OOB panic at t≥4 (graph_krylov)

• Off-by-one bug: wrote past MAX_LANCZOS_DIM=18 when Krylov dimension maxed out at large t·λ_max
• Bug present since A1/ADR-0185; only triggered at deep t
• Fix: Lanczos now matches Chebyshev/dense expm at t∈{4,8,16} (max|Δ|≤1e-9, no panic)
• Gate lanczos_large_t_no_oob validates the fix
• The --no-lanczos workaround is no longer needed

Clippy cast_precision_loss in graph_par_speedup example

• Cleaned up compiler warning in --all-targets build

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See CHANGELOG.md for full context.