feat: luminous navigable galaxy worlds

[udhawan97]

Summary

• brighten Explore mode into a fully lit, language-colored galaxy with distinct animated world materials
• turn module drill-down into a System Sun with parser-owned call orbits and navigable nearby solar systems
• add accessible route direction, certainty, overflow, focus handoff, responsive and reduced-motion coverage
• refresh product captures, documentation, release facts, and deterministic v0.22.0 artifacts

Verification

• 542 Python tests passed; Ruff passed
• web unit/contracts and production build passed
• docs checks and production build passed
• two consecutive full 52-receipt Chromium/WebKit user-flow runs passed
• 29-state space budget, 104-assertion escape surface, and 5,000-module scale gates passed
• native Safari semantic journey passed; WebKit visual suite covers the WebGL layer
• two-round council gate completed and all bounded corrections closed
• reproducible wheel and sdist hashes verified across three builds