Add new environments and enhance tool context functionality

- Introduced new environments: Terminal Test Environment and SWE Environment, each with default configurations for testing and software engineering tasks.
- Added TerminalBench 2.0 evaluation environment with comprehensive setup for agentic LLMs, including task execution and verification.
- Enhanced ToolContext with methods for uploading and downloading files, ensuring binary-safe operations.
- Updated documentation across environments to reflect new features and usage instructions.
- Refactored existing environment configurations for consistency and clarity.

tools/__init__.py

@@ -31,6 +31,8 @@ from .terminal_tool import (
     cleanup_vm,
     cleanup_all_environments,
     get_active_environments_info,
+    register_task_env_overrides,
+    clear_task_env_overrides,
     TERMINAL_TOOL_DESCRIPTION
 )
 
@@ -139,6 +141,8 @@ __all__ = [
     'cleanup_vm',
     'cleanup_all_environments',
     'get_active_environments_info',
+    'register_task_env_overrides',
+    'clear_task_env_overrides',
     'TERMINAL_TOOL_DESCRIPTION',
     # Terminal tools (Hecate/MorphCloud backend)
     'terminal_hecate_tool',