feat(memory): memory_promoted/memory_promotion_declined decision types (F8 emits)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

harness/tests/test_memory_promotion.py

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+"""L1: gate di promozione memorie (F8) — tipi di decisione + filtro candidati.
+
+La promozione era solo CLI facoltativa (mai innescata): il gate reviewer_memory_promote
+la rende un passo del workflow. Questi test fissano il contratto harness-side:
+- i due nuovi decision type esistono e sono ammessi dalla Fase 8 (workflow.yaml emits)
+- i candidati rifiutati al gate (memory_promotion_declined, detail "seq:<n>") non
+  vengono riproposti da reusable_promotions/preview_promotions.
+"""
+from datetime import datetime
+
+from tht.decisions import DecisionRecord
+from tht.workflow import load_workflow
+
+
+def test_promotion_decision_types_are_valid():
+    for t in ("memory_promoted", "memory_promotion_declined"):
+        d = DecisionRecord(
+            seq=1, ts=datetime(2026, 1, 1), type=t, subject="fact_x", detail="seq:5"
+        )
+        assert d.type == t
+
+
+def test_promotion_decision_types_min_phase_is_f8():
+    wf = load_workflow()
+    assert wf.decision_min_phase("memory_promoted") == 8
+    assert wf.decision_min_phase("memory_promotion_declined") == 8