refactor(harness): route workflow persistence through repositories

harness/tht/memory.py

@@ -186,6 +186,14 @@ def promote(
     return promoted
 
 
+def promote_snapshot(snapshot, *, seqs: list[int] | None, registry_path: Path) -> list[MemoryRecord]:
+    existing = load_registry(registry_path)
+    promoted = _compute_promotions(snapshot, snapshot.manifest, seqs=seqs, existing=existing)
+    if promoted:
+        save_registry(existing + promoted, registry_path)
+    return promoted
+
+
 def reusable_promotions(
     session_dir: Path, manifest: SessionManifest, registry_path: Path
 ) -> list[MemoryRecord]:
@@ -203,6 +211,14 @@ def reusable_promotions(
     ]
 
 
+def reusable_promotions_snapshot(snapshot, registry_path: Path) -> list[MemoryRecord]:
+    from tht.phase import effective_decisions
+
+    cand = _compute_promotions(snapshot, snapshot.manifest, seqs=None, existing=load_registry(registry_path))
+    declined = declined_promotion_seqs(effective_decisions(snapshot))
+    return [c for c in cand if c.type in REUSABLE_TYPES and c.decision_seq not in declined]
+
+
 def preview_promotions(
     session_dir: Path, manifest: SessionManifest, registry_path: Path
 ) -> list[MemoryRecord]:
@@ -212,6 +228,10 @@ def preview_promotions(
     ]
 
 
+def preview_promotions_snapshot(snapshot, registry_path: Path) -> list[MemoryRecord]:
+    return reusable_promotions_snapshot(snapshot, registry_path)[:MAX_PROMOTION_CANDIDATES]
+
+
 def memory_vector_records(records: list[MemoryRecord]) -> list[VectorRecord]:
     out: list[VectorRecord] = []
     for r in records: