PUT /api/settings service toggles now resolve from `merged` (persisted +
incoming) instead of the raw request body, so a partial PUT no longer
starts the subagent watcher and stops the workflow + image watchers by
treating every omitted key as "apply the default". Pinned by a 4-case
regression test verified to fail against the old handler.
Also trims the links line from the Codeman callout in the
xterm-zerolag-input README.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>