Add AI Council architecture: Tier 2/3/Graph implementation + Integration Plan

Architecture (Agent 1):
- hermes_memory/tier2/{schema,facts,entities,relations,timeline}.py
- hermes_memory/tier3/{backend,chroma_backend,embedder}.py
- hermes_memory/graph/nx_store.py
- hermes_memory/api/memory_api.py (unified API)
- hermes_memory/cron/{consolidate,embed_queue,graph_refresh,prune}.py
- hermes_memory/config.py + pyproject.toml

Integration Plan (Agent 3):
- INTEGRATION_PLAN.md: Memory Provider Plugin strategy
- Hermes Core needs minimal changes
- sync_turn() + prefetch() hooks
- Skills integration via nextlevel_search/remember

Auto-Extraction (Agent 2):
- ARCHITECTURE.md: Full extraction pipeline docs
- Chunking, Pre-Filter, LLM Prompts, Classification
- Entity-Linking, Temporal Reasoning, Deduplication

All files: Python syntax checked, ECC standards applied.

hermes_memory/cron/prune.py

@@ -0,0 +1,40 @@
+"""Prune — Alte/archivierte Daten entfernen."""
+
+import logging
+import time
+from pathlib import Path
+
+from hermes_memory.config import load_config
+from hermes_memory.tier2.schema import connect
+
+logger = logging.getLogger(__name__)
+
+
+def run_prune(profile: str = "default") -> dict:
+    """Entfernt archivierte Fakten und alte Embeddings."""
+    config = load_config(profile)
+    db_path = Path(config["tier2"]["db_path"].format(
+        HERMES_HOME=Path.home() / ".hermes",
+        profile=profile,
+    ))
+    conn = connect(db_path)
+    now = time.time()
+    ttl = config["limits"]["fact_ttl_days"] * 86400
+
+    # Archivierte Fakten älter als TTL löschen
+    cur = conn.execute(
+        "DELETE FROM facts WHERE is_archived = 1 AND updated_at < ?",
+        (now - ttl,),
+    )
+    deleted_facts = cur.rowcount
+
+    # Verarbeitete Queue-Einträge älter als 7 Tage löschen
+    cur = conn.execute(
+        "DELETE FROM embedding_queue WHERE processed = 1 AND queued_at < ?",
+        (now - 7 * 86400,),
+    )
+    deleted_queue = cur.rowcount
+
+    conn.commit()
+    logger.info("Pruned %s facts, %s queue entries", deleted_facts, deleted_queue)
+    return {"deleted_facts": deleted_facts, "deleted_queue": deleted_queue}