fix: lazy-load proxy startup dependencies

fix(proxy): add fast-fail launch settings

fix(openclaw): use lightweight headroom launcher checks

fix(openclaw): launch Windows headroom shims via shell

refactor(openclaw): DRY up duplicate code across plugin

fix(openclaw): proxyPort only applies to local URLs, consistency pass

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

docs: add OpenClaw plugin section to main README

Restore pythonPath and proxyPort config support

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

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