feat(genome): deterministic mutation operators (numeric + categorical)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/unit/test_genome_mutation.py

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+import random
+
+import pytest
+
+from multi_swarm.genome.hypothesis import HypothesisAgentGenome, ModelTier
+from multi_swarm.genome.mutation import (
+    COGNITIVE_STYLES,
+    FEATURE_POOL,
+    mutate_cognitive_style,
+    mutate_feature_access,
+    mutate_lookback,
+    mutate_temperature,
+)
+
+
+@pytest.fixture
+def base_genome() -> HypothesisAgentGenome:
+    return HypothesisAgentGenome(
+        system_prompt="x",
+        feature_access=["close"],
+        temperature=0.9,
+        top_p=0.95,
+        model_tier=ModelTier.C,
+        lookback_window=200,
+        cognitive_style="physicist",
+    )
+
+
+def test_mutate_temperature_within_bounds(base_genome: HypothesisAgentGenome) -> None:
+    rng = random.Random(0)
+    for _ in range(50):
+        new = mutate_temperature(base_genome, rng)
+        assert 0.6 <= new.temperature <= 1.3
+
+
+def test_mutate_lookback_within_bounds(base_genome: HypothesisAgentGenome) -> None:
+    rng = random.Random(0)
+    for _ in range(50):
+        new = mutate_lookback(base_genome, rng)
+        assert 50 <= new.lookback_window <= 500
+
+
+def test_mutate_feature_access_changes_set(base_genome: HypothesisAgentGenome) -> None:
+    rng = random.Random(0)
+    new = mutate_feature_access(base_genome, rng)
+    assert set(new.feature_access) != set(base_genome.feature_access) or len(FEATURE_POOL) == 1
+    assert all(f in FEATURE_POOL for f in new.feature_access)
+    assert len(new.feature_access) >= 1
+
+
+def test_mutate_cognitive_style_uses_pool(base_genome: HypothesisAgentGenome) -> None:
+    rng = random.Random(0)
+    new = mutate_cognitive_style(base_genome, rng)
+    assert new.cognitive_style in COGNITIVE_STYLES
+
+
+def test_mutation_preserves_lineage(base_genome: HypothesisAgentGenome) -> None:
+    rng = random.Random(0)
+    new = mutate_temperature(base_genome, rng)
+    assert base_genome.id in new.parent_ids
+    assert new.id != base_genome.id