fix: resolve all ruff lint errors (F401, F841, E741, I001)

Remove unused imports, fix unsorted import blocks, rename ambiguous
variable, and remove unused local variable assignment.

pkg/hanzo-mcp/hanzo_mcp/zap_server.py

@@ -17,7 +17,7 @@ import json
 import logging
 import struct
 import time
-from typing import Any, Callable, Awaitable
+from typing import Any, Awaitable, Callable
 
 logger = logging.getLogger(__name__)
 

pkg/hanzo-tools-code/hanzo_tools/code/code_tool.py

@@ -18,13 +18,11 @@ Scope: File → Package → Repo
 """
 
 import difflib
-import json
 import os
 from dataclasses import dataclass, field
 from pathlib import Path
 from typing import Any, ClassVar, Literal
 
-from mcp.server import FastMCP
 from mcp.server.fastmcp import Context as MCPContext
 
 from hanzo_tools.core import (
@@ -720,7 +718,7 @@ All operations are PURE - safe to cache and parallelize.
             if not full_path.exists():
                 raise NotFoundError(f"File not found: {path}")
             text = full_path.read_text()
-            export_lines = [l.strip() for l in text.splitlines() if l.strip().startswith(("export ", "pub ", "__all__"))]
+            export_lines = [line.strip() for line in text.splitlines() if line.strip().startswith(("export ", "pub ", "__all__"))]
             return {"uri": str(full_path), "exports": export_lines, "count": len(export_lines)}
 
         @self.action("types", "Find type definitions in file")

pkg/hanzo-tools-memory/hanzo_tools/memory/memory_tool.py

@@ -573,6 +573,7 @@ Examples:
     async def _export(self, scope: str, limit: int) -> str:
         """Export memories as JSON."""
         import json as json_mod
+
         from hanzo_tools.memory.markdown_memory import get_markdown_backend
         backend = get_markdown_backend()
         backend._ensure_loaded()

pkg/hanzo-tools-net/hanzo_tools/net/fetch_tool.py

@@ -11,14 +11,12 @@ Network operations are inherently non-deterministic.
 """
 
 import asyncio
-import json
 import os
 import re
 from pathlib import Path
-from typing import Any, ClassVar
+from typing import ClassVar
 from urllib.parse import urljoin, urlparse
 
-from mcp.server import FastMCP
 from mcp.server.fastmcp import Context as MCPContext
 
 from hanzo_tools.core import (
@@ -523,7 +521,6 @@ Effect: NONDETERMINISTIC_EFFECT (network I/O)
             Effect: NONDETERMINISTIC_EFFECT
             """
             import platform
-            import subprocess
 
             system = platform.system().lower()
             if system == "darwin":

pkg/hanzo-tools-plan/hanzo_tools/plan/plan_tool.py

@@ -14,14 +14,12 @@ Effect lattice:
 - execute: NONDETERMINISTIC (audit-friendly)
 """
 
-import json
 import re
 from dataclasses import dataclass, field
 from datetime import datetime, timezone
 from enum import Enum
 from typing import Any, ClassVar
 
-from mcp.server import FastMCP
 from mcp.server.fastmcp import Context as MCPContext
 
 from hanzo_tools.core import (

pkg/hanzo-tools-vcs/hanzo_tools/vcs/git_tool.py

@@ -14,11 +14,9 @@ Outputs diffs in unified patch format; integrates with fs.apply_patch.
 """
 
 import asyncio
-import json
 import os
-from typing import Any, ClassVar
+from typing import ClassVar
 
-from mcp.server import FastMCP
 from mcp.server.fastmcp import Context as MCPContext
 
 from hanzo_tools.core import (
@@ -570,7 +568,6 @@ Outputs diffs in unified patch format for use with fs.apply_patch.
 
         @self.action("init", "Initialize repository")
         async def init(ctx: MCPContext, path: str | None = None, bare: bool = False, cwd: str | None = None) -> dict:
-            work_dir = path or cwd or self.cwd
             args = ["init"]
             if bare:
                 args.append("--bare")

pkg/hanzo-tools/hanzo_tools/core/unified.py

@@ -396,8 +396,8 @@ class BaseTool(_BaseToolABC):
         from pydantic import ConfigDict
         from mcp.server.fastmcp.tools.base import Tool as FastMCPTool
         from mcp.server.fastmcp.utilities.func_metadata import (
-            FuncMetadata,
             ArgModelBase,
+            FuncMetadata,
         )
 
         tool_name = self.name

tests/conformance/benchmark_parallel.py

@@ -12,16 +12,16 @@ Usage:
 
 from __future__ import annotations
 
-import asyncio
-import json
 import os
-import statistics
 import sys
-import tempfile
+import json
 import time
-from dataclasses import dataclass, field
-from pathlib import Path
+import asyncio
+import tempfile
+import statistics
 from typing import Any
+from pathlib import Path
+from dataclasses import field, dataclass
 
 HANZO_ROOT = Path(os.environ.get("HANZO_ROOT", Path.home() / "work" / "hanzo"))
 TIMEOUT = 30

tests/conformance/run_conformance.py

@@ -25,17 +25,17 @@ Usage:
 
 from __future__ import annotations
 
-import asyncio
-import json
 import os
 import re
-import shutil
 import sys
-import tempfile
+import json
 import time
-from dataclasses import dataclass, field
-from pathlib import Path
+import shutil
+import asyncio
+import tempfile
 from typing import Any
+from pathlib import Path
+from dataclasses import field, dataclass
 
 # ── Configuration ─────────────────────────────────────────────────────────────