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Convert all remaining lowercase 'x' used as multiplication (e.g., "1000x faster") to $\times$ across 17 vol2 chapters. These were flagged by the new lowercase_x_multiplication validator check. Simplifies the validator regex from a fragile word-list approach to a broader pattern matching digit-x-lowercase (e.g., \dx\s+[a-z]) which naturally excludes hardware counts (8x A100) and hex literals (0x61). Includes the conversion script in _archive.