feat(openclaw): support remote Headroom proxy (connect-only)

docs: add OpenClaw plugin section to main README

Remove skipped integration test registration

Add comprehensive tests for proxy detection and launcher logic

Restore pythonPath and proxyPort config support

Clarify local npm install path for launcher detection

Auto-detect proxyUrl by default and keep explicit override

Add ordered launcher fallback for headroom proxy startup

Add controlled proxy autostart and unsafe-install guidance

Harden openclaw plugin proxy handling and metadata

Rename plugin to headroom-openclaw (npm scope not available)

OpenClaw plugin fixes, telemetry fix, cost tracker improvement, tokenBudget support

feat: add OpenClaw ContextEngine plugin (@headroom-ai/openclaw)