Address code review feedback for MCP implementation

[Copilot]

Fixes issues identified by automated code review on the MCP infrastructure PR.

http_server.py

• Add hasattr guard before accessing mcp_client to prevent AttributeError on non-MCP environments
• Use JSON-RPC error code -32603 (Internal error) instead of -32600 (Invalid Request) for missing MCP config
• Add parse error handling with -32700 for malformed JSON requests
• Add validation for missing tool_name in CallToolAction deserialization
• Add missing MCPEnvironment import
• Remove unused json import

mcp_environment.py

• Remove invalid mcp_client kwarg from super().__init__() (base Environment doesn't accept it)

client.py

• Implement list_tools() and echo_message() convenience methods (referenced in docstring but missing)
• Move typing imports to top of file per PEP 8
• Remove unused ListToolsAction import

pyproject.toml

• Remove openenv_core.mcp package reference (directory doesn't exist)

RFC-003-implementation-journal.md

• Fix filename references from mcp_tools.py to mcp_server.py

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[Darktex]

@copilot see my feedback

[Darktex]

We should do the opposite: remove list_tools and echo_message as methods, and remove each and every reference to them