chore: remove all remaining mini-swe-agent references

Complete cleanup after dropping the mini-swe-agent submodule (PR #2804):

- Remove MSWEA_SILENT_STARTUP and MSWEA_GLOBAL_CONFIG_DIR env var
  settings from cli.py, run_agent.py, hermes_cli/main.py, doctor.py
- Remove mini-swe-agent health check from hermes doctor
- Remove 'minisweagent' from logger suppression lists
- Remove litellm/typer/platformdirs from requirements.txt
- Remove mini-swe-agent install steps from install.ps1 (Windows)
- Remove mini-swe-agent install steps from website docs
- Update all stale comments/docstrings referencing mini-swe-agent
  in terminal_tool.py, tools/__init__.py, code_execution_tool.py,
  environments/README.md, environments/agent_loop.py
- Remove mini_swe_runner from pyproject.toml py-modules
  (still exists as standalone script for RL training use)
- Shrink test_minisweagent_path.py to empty stub

The orphaned mini-swe-agent/ directory on disk needs manual removal:
  rm -rf mini-swe-agent/

hermes_cli/main.py

@@ -60,9 +60,6 @@ from hermes_cli.config import get_hermes_home
 from hermes_cli.env_loader import load_hermes_dotenv
 load_hermes_dotenv(project_env=PROJECT_ROOT / '.env')
 
-# Point mini-swe-agent at ~/.hermes/ so it shares our config
-os.environ.setdefault("MSWEA_GLOBAL_CONFIG_DIR", str(get_hermes_home()))
-os.environ.setdefault("MSWEA_SILENT_STARTUP", "1")
 
 import logging
 import time as _time