G5: bump engine (regex tooling), showcase grouping/patch/validators

Engine pointer -> d044caf (formula gene grouping, content patches, def
field validation). Game-side demonstration of all three:

- genes.json: GeneHardiness whose effect is gsum('Gene.*Tolerance') — a
  derived trait summing all tolerance genes via regex grouping.
- patches.json: a content patch giving every Bush* plant a wood harvest
  product, applied to Core's own defs at load.
- GameContent registers load-time validators: Gene/Product defNames must
  carry their type prefix.
- Program: a --check-content headless mode that loads all mod defs (running
  patches + validators) and computes a sample genome's traits (compiling
  every gene formula, grouping included) — a CI-friendly content lint.

Verified: --check-content reports 6 def types, 18 genes, 8 plants, 18
traits with hardiness computed from the gene group. Full suite green.

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

Mods/Core/Defs/patches.json

@@ -0,0 +1,8 @@
+{
+  "type": "Patch",
+  // Контент-патчи (фаза G5): применяются ко всем дефам типа defType, чьё имя подходит под regex match,
+  // проставляя поля set. Демонстрация: даём кустам древесину при сборе (веточки).
+  "patches": [
+    { "defType": "Plant", "match": "Bush.*", "set": { "harvestProduct": "ProductWood" } }
+  ]
+}