G4: gene-driven content — fruiting, harvest products, leaf color

New plant content, all driven by genes through the trait layer (no engine
change — the genetics machinery already supports it).

- ProductDef + products.json (wood, grass, berries, acorn) — what plants
  yield; localized labels (ru/en).
- New numeric genes (genes.json): GeneFruitYield, GeneFruitSeason,
  GeneHarvestAmount, GeneLeafHue, each declaring its trait via formula.
  GenomeDef carries the per-species bases (PlantSet maps them into the
  species template); PlantDef gains harvestProduct / fruitProduct.
- PlantPhenotype gains FruitYield/FruitSeason/HarvestAmount/LeafHue.
  PlantFactory tints the sprite from the leaf-hue gene (combined with the
  morph variant). Plants carry a Fruiting component; PlantFruitingSystem
  ripens fruit on mature plants during their gene-chosen season and drops
  it off-season.
- plants.json: trees give wood + acorns (autumn), bushes berries (summer),
  grass gives grass — amounts/season/hue from genes.
- 'plant <species> [seed]' console command samples a species genome and
  prints its gene-driven traits and products.

Build clean; def JSON validated; boot smoke loads the new content.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Mods/Core/Defs/genes.json

@@ -45,6 +45,20 @@
       "default": 0.05, "min": 0.0, "max": 1.0, "tags": ["reproduction"],
       "effects": { "mutationRate": "value" } },
 
+    // --- Контент (фаза G4): плодоношение, добыча, цвет ---
+    { "defName": "GeneFruitYield", "parent": "BaseNumericGene", "label": "gene.fruitYield",
+      "default": 0, "min": 0, "max": 12, "tags": ["fruiting"],
+      "effects": { "fruitYield": "value" } },
+    { "defName": "GeneFruitSeason", "parent": "BaseNumericGene", "label": "gene.fruitSeason",
+      "default": 1, "min": 0, "max": 3, "spread": 0, "mutationChance": 0, "tags": ["fruiting"],
+      "effects": { "fruitSeason": "value" } },
+    { "defName": "GeneHarvestAmount", "parent": "BaseNumericGene", "label": "gene.harvestAmount",
+      "default": 1, "min": 0, "max": 50, "tags": ["harvest"],
+      "effects": { "harvestAmount": "value" } },
+    { "defName": "GeneLeafHue", "parent": "BaseNumericGene", "label": "gene.leafHue",
+      "default": 0.33, "min": 0, "max": 1, "spread": 0.04, "tags": ["morphology", "color"],
+      "effects": { "leafHue": "value" } },
+
     // Дискретный ген морфы: вариант 0 доминирует, 1 (рецессивный) виден только в гомозиготе.
     { "defName": "GeneMorph", "kind": "Discrete", "label": "gene.morph",
       "variants": 2, "variantWeights": [0.82, 0.18], "mutationChance": 0.05, "tags": ["morphology"],