feat(memory): implement OpenRouter + pgvector memory pipeline

.scripts/memory/query_pgvector.py

@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+
+import argparse
+
+from index_common import embed_text, get_conn, vector_literal
+
+
+def sanitize(text: str) -> str:
+    return text.replace('```', '` ` `').strip()
+
+
+def query(text: str, top_k: int = 5, max_chars: int = 2500) -> str:
+    embedding = embed_text(text)
+    vector = vector_literal(embedding)
+
+    with get_conn() as conn:
+        with conn.cursor() as cur:
+            cur.execute(
+                '''
+                SELECT source, content
+                FROM memory_primary
+                ORDER BY embedding <=> %s::vector
+                LIMIT %s
+                ''',
+                (vector, top_k),
+            )
+            rows = cur.fetchall()
+
+    parts: list[str] = []
+    total_len = 0
+    for source, content in rows:
+        snippet = sanitize(content[:600])
+        block = f'<retrieved_context source="{source}">\n{snippet}\n</retrieved_context>'
+        if total_len + len(block) > max_chars:
+            break
+        parts.append(block)
+        total_len += len(block)
+
+    return '\n\n'.join(parts)
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument('query', nargs='+')
+    parser.add_argument('--top-k', type=int, default=5)
+    parser.add_argument('--max-chars', type=int, default=2500)
+    args = parser.parse_args()
+
+    text = ' '.join(args.query).strip()
+    if not text:
+        return
+    print(query(text, top_k=args.top_k, max_chars=args.max_chars))
+
+
+if __name__ == '__main__':
+    main()