feat(cli): add configurable status bar styles

[ghost]

Summary

• Add configurable CLI status bar styles via /statusbar arguments
• Add display.status_bar_style config support and tool config plumbing
• Document the new status bar style options
• Add tests for status bar rendering and tools-config behavior

Test plan

• venv/bin/python -m pytest tests/cli/test_cli_status_bar.py tests/hermes_cli/test_tools_config.py -q
• venv/bin/python -m ruff check cli.py hermes_cli/commands.py hermes_cli/config.py hermes_cli/tools_config.py tests/cli/test_cli_status_bar.py tests/hermes_cli/test_tools_config.py
• git diff --check origin/main...HEAD

[alt-glitch]

Related: #17654 (configurable status line fields — open, same area). The existing merged #14015 already added skin-aware status bar colors. Please coordinate with #17654 to avoid conflicting implementations.