Spectrum: Optical

Pre-release stabilization patch for Spectrum: Optical.

• Added an explicit fabric-language-kotlin dependency to fabric.mod.json, so the release jar can launch correctly outside the development environment.
• Fixed beam receiver redstone flickering: receiver active time is now synchronized with the beam recalculation interval.
• Fixed color mixing in the converging lens: RGB channels are now added with clamping, so yellow, purple, and cyan beams correctly trigger their effects.
• Capped focused beam intensity to prevent lens chains from scaling power without limit.
• Spectrum optical control blocks are no longer destroyed by white beams or ignited by red beams at the beam endpoint.
• Fixed blue beam fluid behavior: water freezes into ice, while lava turns into obsidian or cobblestone.
• Separated color effect ranges so base and mixed colors do not trigger multiple effects at the same time.
• Purple beams no longer teleport entities into solid blocks.
• Fixed long beam render culling: beam renderers now render outside the source block entity bounding box.
• Improved cycle protection when lenses recalculate beam paths.
• Added run/ to .gitignore to keep logs, saves, and development cache files out of the repository.