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/graph_refresh.py

@@ -0,0 +1,14 @@
+"""Graph-Rebuild Job."""
+
+import logging
+from hermes_memory.api.memory_api import MemoryAPI
+
+logger = logging.getLogger(__name__)
+
+
+def run_graph_refresh(profile: str = "default") -> dict:
+    """Baut Knowledge Graph aus Tier 2 neu auf."""
+    api = MemoryAPI(profile=profile)
+    result = api.graph_rebuild()
+    logger.info("Graph refresh complete: %s", result)
+    return result