Disc Image Studio v1.4.0 tunes calibration, speed

This is a substantial engineering release that makes experimental optical-disc imaging more reproducible and practical, especially for users working across different media batches and burners.

• –Three-stage calibration now supports coarse, boundary, and fine measurement workflows with reusable independent records.
• –Cubic track-pitch fitting preserves geometry through presets, projects, generation, and previews, addressing real-world disc variation.
• –Parallel sampling and cached sRGB calculations improve throughput while preserving byte-for-byte output and ordering.
• –Session-isolated caches and reduced single-file extraction make multi-instance use safer and startup significantly lighter.
• –The project remains hardware-sensitive: direct burning is experimental, and successful results still depend on the disc, drive, firmware, and write strategy.