(build 0.3) Biosphere and biodiversity

Ok.. here we go. This update introduces the new Biosphere system: planets can now develop aquatic life, land life, plants, animals, traits, food chains, environmental quality, and new ways for the Creator to guide or disrupt evolution.

It is a huge update and, more importantly, a foundation for future features connected to life, intelligence, civilizations, and planetary development. Because of its size, some rough edges are expected, so bug reports and feedback will be especially helpful.

Many plant and animal species may still be missing final artwork for now. I will keep adding species visuals gradually in future updates.

• Added the new Biosphere system with aquatic, small land, medium land, and large land life layers.

• Added individual plant and animal species with population growth, extinction, needs, traits, and food-chain relationships.

• Added air, water, and soil quality as living environmental systems shaped by species traits.

• Added detailed Biosphere panel with strata, species slots, generation progress, tooltips, and species details.

• Added Spark of Life, allowing the Creator to force the evolution of a new species.

• Added species-level Creator actions: Support Growth and Cull Population.

• Added the new divine power: Word of Gaia.

• Reworked intelligence growth so mature biospheres are required before sapient life can emerge.

• Added biosphere effects on civilization happiness and natural agriculture employment.

• Expanded the tutorial to include the new biosphere development.