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/

website/docs/developer-guide/contributing.md

@@ -49,7 +49,6 @@ export VIRTUAL_ENV="$(pwd)/venv"
 
 # Install with all extras (messaging, cron, CLI menus, dev tools)
 uv pip install -e ".[all,dev]"
-uv pip install -e "./mini-swe-agent"
 uv pip install -e "./tinker-atropos"
 
 # Optional: browser tools