[squad:plan] Hollowlight art direction, tutorial and docs (Verbal) #67416

Owner: Verbal.

• Style guide: palette, ink textures, pulse VFX, colour-blind-safe variants.
• Tutorial level teaching ping, energy, and hazards without text walls.
• README with controls, build and contribution notes.
• Acceptance: style guide merged; tutorial understood by new playtesters unaided.

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• expires on Oct 11, 2026, 3:58 AM UTC-08:00