feat(genome): HypothesisAgentGenome with deterministic id and serde

Dataclass per genoma agente ipotesi con campi prompt/feature/temperature/
top_p/model_tier/lookback/style + parent_ids/generation. Id sha1[:16]
deterministico su contenuto canonico (feature_access ordinate, float
arrotondati). to_dict/from_dict per persistenza.

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

tests/unit/test_genome_hypothesis.py

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+from multi_swarm.genome.hypothesis import HypothesisAgentGenome, ModelTier
+
+
+def test_genome_creation_defaults():
+    g = HypothesisAgentGenome(
+        system_prompt="Pensa come un fisico.",
+        feature_access=["close", "volume"],
+        temperature=0.9,
+        top_p=0.95,
+        model_tier=ModelTier.C,
+        lookback_window=200,
+        cognitive_style="physicist",
+    )
+    assert g.id is not None
+    assert g.parent_ids == []
+    assert g.generation == 0
+
+
+def test_genome_serialization_roundtrip():
+    g = HypothesisAgentGenome(
+        system_prompt="Pensa come un biologo.",
+        feature_access=["close", "high", "low"],
+        temperature=1.1,
+        top_p=0.9,
+        model_tier=ModelTier.C,
+        lookback_window=300,
+        cognitive_style="biologist",
+        parent_ids=["abc"],
+        generation=5,
+    )
+    payload = g.to_dict()
+    g2 = HypothesisAgentGenome.from_dict(payload)
+    assert g2.system_prompt == g.system_prompt
+    assert g2.feature_access == g.feature_access
+    assert g2.temperature == g.temperature
+    assert g2.parent_ids == g.parent_ids
+    assert g2.generation == g.generation
+    assert g2.id == g.id
+
+
+def test_genome_id_is_deterministic_on_content():
+    g1 = HypothesisAgentGenome(
+        system_prompt="X", feature_access=["close"], temperature=0.5,
+        top_p=0.9, model_tier=ModelTier.C, lookback_window=100, cognitive_style="x",
+    )
+    g2 = HypothesisAgentGenome(
+        system_prompt="X", feature_access=["close"], temperature=0.5,
+        top_p=0.9, model_tier=ModelTier.C, lookback_window=100, cognitive_style="x",
+    )
+    assert g1.id == g2.id