fix: deep GPU integration, fix all ruff/mypy issues, add .dockerignore

- Integrate GPU scoring inline into reasoning/multi_path.py (auto-uses GPU when available)
- Integrate GPU deduplication into multi_agent/consensus_engine.py
- Add semantic_search() method to memory/semantic_graph.py with GPU acceleration
- Integrate GPU training into self_improvement/training.py AutoTrainer
- Fix all 758 ruff lint issues (whitespace, import sorting, unused imports, ambiguous vars, undefined names)
- Fix all 40 mypy type errors across the codebase (no-any-return, union-attr, arg-type, etc.)
- Fix deprecated ruff config keys (select/ignore -> [tool.ruff.lint])
- Add .dockerignore to exclude .venv/, tests/, docs/ from Docker builds
- Add type hints and docstrings to verification/outcome.py
- Fix E402 import ordering in witness_agent.py
- Fix F821 undefined names in vector_pgvector.py and native.py
- Fix E741 ambiguous variable names in reflective.py and recommender.py

All 276 tests pass. 0 ruff errors. 0 mypy errors.

Co-Authored-By: Nakamoto, S <defi@defi-oracle.io>

fusionagi/memory/postgres_backend.py

@@ -100,7 +100,7 @@ class InMemoryBackend(MemoryBackend):
 def create_postgres_backend(connection_string: str) -> MemoryBackend | None:
     """Create Postgres-backed MemoryBackend when psycopg is available."""
     try:
-        import psycopg
+        import psycopg  # noqa: F401
     except ImportError:
         logger.debug("psycopg not installed; use pip install fusionagi[memory]")
         return None
@@ -149,6 +149,7 @@ class PostgresMemoryBackend(MemoryBackend):
         retention_policy: str = "session",
     ) -> None:
         import json
+
         import psycopg
 
         with psycopg.connect(self._conn_str) as conn:
@@ -165,6 +166,7 @@ class PostgresMemoryBackend(MemoryBackend):
 
     def get(self, id: str) -> dict[str, Any] | None:
         import json
+
         import psycopg
 
         with psycopg.connect(self._conn_str) as conn:
@@ -196,6 +198,7 @@ class PostgresMemoryBackend(MemoryBackend):
         limit: int = 100,
     ) -> list[dict[str, Any]]:
         import json
+
         import psycopg
 
         q = "SELECT id, tenant_id, user_id, session_id, type, content, metadata, retention_policy FROM memory_items WHERE tenant_id = %s"