feat(python): add zeroclaw-tools companion package for LangGraph tool calling

- Add Python package with LangGraph-based agent for consistent tool calling
- Provides reliable tool execution for providers with inconsistent native support
- Includes tools: shell, file_read, file_write, web_search, http_request, memory
- Discord bot integration included
- CLI tool for quick interactions
- Works with any OpenAI-compatible provider (Z.AI, OpenRouter, Groq, etc.)

Why: Some LLM providers (e.g., GLM-5/Zhipu) have inconsistent tool calling behavior.
LangGraph's structured approach guarantees reliable tool execution across all providers.

python/zeroclaw_tools/tools/__init__.py

@@ -0,0 +1,20 @@
+"""
+Built-in tools for ZeroClaw agents.
+"""
+
+from .base import tool
+from .shell import shell
+from .file import file_read, file_write
+from .web import web_search, http_request
+from .memory import memory_store, memory_recall
+
+__all__ = [
+    "tool",
+    "shell",
+    "file_read",
+    "file_write",
+    "web_search",
+    "http_request",
+    "memory_store",
+    "memory_recall",
+]