feat(themes): whitelist governance, synergy cap, docs + tests; feat(random): laid roadwork for random implementation, testing in headless confirmed

code/tests/test_builder_rng_seeded_stream.py

@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+from deck_builder.builder import DeckBuilder
+
+
+def test_builder_rng_same_seed_identical_streams():
+    b1 = DeckBuilder()
+    b1.set_seed('alpha')
+    seq1 = [b1.rng.random() for _ in range(5)]
+
+    b2 = DeckBuilder()
+    b2.set_seed('alpha')
+    seq2 = [b2.rng.random() for _ in range(5)]
+
+    assert seq1 == seq2