M1: Headless parity verified between Tools and Godot

Proves Theriapolis.Core works untouched under Godot's csproj — the worldgen
pipeline produces byte-identical output whether invoked from the Tools CLI
or from inside the Godot process. This is the determinism contract surviving
the port.

Architecture test:
  CoreNoDependencyTests now forbids Godot.* and GodotSharp in addition to
  Microsoft.Xna and MonoGame. Both bans stay in force for the duration of
  the port so neither engine can leak into Core.

Determinism oracle:
  New worldgen-hash Tools command runs the full pipeline and prints FNV-1a
  hashes for every channel (elevation, moisture, temperature, biomes,
  settlements, polylines) plus per-stage hashes. Pairs with the Godot
  smoke-test for cross-process verification.

Godot-side smoke test:
  SmokeTest.cs runs WorldGenerator.RunAll inside the Godot process; Main.cs
  fires it on --smoke-test <seed>. Resolves Content/Data via res:// walk-up.
  M0 hello-world behaviour preserved when launched without the flag.

Verification (seed 12345):
  - dotnet run -- worldgen-hash and Godot --headless --smoke-test agree on
    all 6 channels and all 14 per-stage hashes (diff produces zero output)
  - 10-run sweeps stable on both sides post-determinism-fix
  - dotnet test: 708/708 pass

Closes M1 of theriapolis-rpg-implementation-plan-godot-port.md.
Next: M2 (world map render).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Theriapolis.Tools/Program.cs

@@ -10,6 +10,7 @@ return args[0].ToLowerInvariant() switch
 {
     "hello"              => Hello(),
     "worldgen-dump"      => WorldgenDump.Run(args[1..]),
+    "worldgen-hash"      => WorldgenHash.Run(args[1..]),
     "settlement-report"  => SettlementReport.Run(args[1..]),
     "tile-inspect"       => TileInspect.Run(args[1..]),
     "tactical-dump"      => TacticalDump.Run(args[1..]),
@@ -49,6 +50,10 @@ static void PrintHelp()
     Console.WriteLine("                --out <file.png>");
     Console.WriteLine("                [--data-dir <dir>]");
     Console.WriteLine("                [--show-violations]");
+    Console.WriteLine("  worldgen-hash --seed <n>          Run full pipeline and print FNV-1a hashes (elevation,");
+    Console.WriteLine("                [--data-dir <dir>]  moisture, temperature, biomes, settlements, polylines)");
+    Console.WriteLine("                                    plus per-stage hashes. Determinism oracle for the");
+    Console.WriteLine("                                    Godot port (compare to Godot host's smoke-test output).");
     Console.WriteLine("  settlement-report --seed <n>      Run full pipeline and print settlement report.");
     Console.WriteLine("                [--data-dir <dir>]");
     Console.WriteLine("  tile-inspect --seed <n>           Print polylines/bridges near a reported tile.");