Merge main and rename MCP types to mcp_types.py

[Copilot]

Merges main branch into the MCP implementation PR, resolving 13 file conflicts. Also addresses reviewer feedback to rename MCP-specific types to avoid conflicts with Python's built-in types module.

Changes

• New module mcp_types.py: Extracted MCP-specific types (ListToolsAction, CallToolAction, ListToolsObservation, CallToolObservation) from types.py into dedicated module
• Updated imports: All references to MCP types now import from mcp_types instead of types
• Merged from main:
  • snake_env environment
  • CodingAction → CodeAction rename
  • PyPI workflow build path updates
  • uvicorn standard extras

Usage

# Before
from core.env_server.types import CallToolAction, ListToolsAction

# After  
from core.env_server.mcp_types import CallToolAction, ListToolsAction
from core.env_server.types import Action, Observation  # base types unchanged

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