Remove lossy default-action writes that can replace china-proxy
with gfwlist. Preserve legacy preference reads and derive the
default action from the selected preset.
Update tests to use explicit presets and verify identity,
legacy compatibility, and no-op reselection.
Add Mainland China proxy routing with independent rule workspaces.
Preserve existing routing choices through equivalent preset mappings.
BREAKING CHANGE: existing custom rules and enablement settings are
not migrated. Recreate them in the appropriate preset.
Separate Agent supervision from sslocal input and preserve the latest intent after deployment failure. Persist failure barriers, serialize publication and retirement, and verify reload and single-instance behavior with real processes.
Refs #83
Qiu Yuzhou